List of Supergirl characters

This article is about characters appearing in the television series. For supporting characters of the comic book character, see Supergirl § Supporting characters.

Supergirl is an American television series developed by Greg Berlanti, Ali Adler, and Andrew Kreisberg based on the characters created by Jerry Siegel and Joe Shuster in the "Superman" franchise and Al Plastino and Otto Binder's character Supergirl. The series stars Melissa Benoist in the titular role of Kara Zor-El / Kara Danvers / Supergirl, as well as Mehcad Brooks, Chyler Leigh, Jeremy Jordan, David Harewood, and Calista Flockhart, with Chris Wood, Floriana Lima, Katie McGrath, Odette Annable, Jesse Rath, Sam Witwer, Nicole Maines, April Parker Jones, Azie Tesfai, Andrea Brooks, Julie Gonzalo and Staz Nair joining in later seasons. In addition to original characters, several other characters from DC Comics universe also appear throughout the series. For its first season, Supergirl aired on CBS, before moving to The CW for its second season.

The series follows Kryptonian refugee and Superman's biological cousin Kara Zor-El (Benoist), who, after hiding her powers on Earth for more than a decade, becomes National City's superhero as Supergirl, battles against extraterrestrial and otherworldly threats, criminal masterminds, being targeted by her cousin's rogues gallery, and encountering an emerging community of metahumans within her adoptive world and individuals from parallel universes. Supergirl also deals with Earth's populace's fears and hostility against extraterrestrials and other beings with superpowers, leading her into conflicts with industrialist Maxwell Lord (Peter Facinelli), Lucy Lane's (Jenna Dewan) father General Sam Lane (Glenn Morshower), and Project Cadmus. She is assisted by a few close friends and family who guard her secrets—most notably her cousin's longtime friend James Olsen (Brooks), her adopted sister Alex Danvers (Leigh), and the Martian survivor J'onn J'onzz (Harewood).

The following is a list of characters who have appeared in the television series. Many are named after (or based on) DC Comics characters.

Overview

Character	Portrayed by	First appearance	Seasons
			1	2	3	4	5
Main characters
Kara Zor-El / Kara Danvers / Supergirl	Melissa Benoist	"Pilot"	Main
James Olsen / Guardian	Mehcad Brooks		Main
Alex Danvers	Chyler Leigh		Main
Winn Schott	Jeremy Jordan		Main			Does not appear
J'onn J'onzz / Martian Manhunter	David Harewood		Main
Cat Grant	Calista Flockhart		Main	Recurring	Guest	Does not appear
Maggie Sawyer	Floriana Lima	"Welcome to Earth"	Does not appear	Main	Recurring	Does not appear
Mon-El	Chris Wood	"The Adventures of Supergirl"	Does not appear	Main		Does not appear
Lena Luthor	Katie McGrath		Does not appear	Recurring	Main
Samantha Arias / Reign	Odette Annable	"Girl of Steel"	Does not appear		Main	Does not appear
Querl Dox / Brainiac 5	Jesse Rath	"Legion of Superheroes"	Does not appear		Recurring	Main
Nia Nal / Dreamer	Nicole Maines	"American Alien"	Does not appear			Main
Ben Lockwood / Agent Liberty	Sam Witwer		Does not appear			Main	Does not appear
Lauren Haley	April Parker Jones	"Ahimsa"	Does not appear			Main	Does not appear
Kelly Olsen	Azie Tesfai	"O Brother, Where Art Thou?"	Does not appear			Recurring	Main
Eve Teschmacher	Andrea Brooks	"The Adventures of Supergirl"	Does not appear	Recurring			Main
Andrea Rojas	Julie Gonzalo	"Event Horizon"	Does not appear				Main
William Dey	Staz Nair		Does not appear				Main
Recurring characters
Eliza Danvers	Helen Slater	"Pilot"	Recurring	Guest			Does not appear
Jeremiah Danvers	Dean Cain		Recurring		Does not appear
Agent Vasquez	Briana Venskus		Recurring	Guest		Does not appear
Astra In-Ze	Laura Benanti		Recurring	Does not appear
Alura Zor-El			Recurring	Guest	Does not appear
	Erica Durance	"Girl of Steel"	Does not appear		Recurring	Does not appear
Non	Chris Vance	"Stronger Together"	Recurring	Does not appear
Maxwell Lord	Peter Facinelli		Recurring	Does not appear
Lucy Lane	Jenna Dewan-Tatum	"Fight or Flight"	Recurring	Does not appear
Leslie Willis / Livewire	Brit Morgan	"Livewire"	Recurring	Guest		Does not appear
Sam Lane	Glenn Morshower	"Red Faced"	Recurring	Does not appear
Siobhan Smythe / Silver Banshee	Italia Ricci	"Truth, Justice and the American Way"	Recurring	Does not appear
Indigo	Laura Vandervoort	"Solitude"	Recurring	Does not appear
Kal-El / Clark Kent / Superman	Tyler Hoechlin	"The Adventures of Supergirl"	Stand-in	Recurring	Does not appear	Guest	Does not appear
Lillian Luthor	Brenda Strong		Does not appear	Recurring	Guest	Recurring	Does not appear
Snapper Carr	Ian Gomez	"The Last Children of Krypton"	Does not appear	Recurring	Does not appear
Olivia Marsdin	Lynda Carter	"Welcome to Earth"	Does not appear	Recurring	Does not appear	Guest	Does not appear
M'gann M'orzz / Miss Martian	Sharon Leal		Does not appear	Recurring	Guest	Does not appear
Demos	Curtis Lum	"The Martian Chronicles"	Does not appear	Recurring	Guest	Does not appear
Lyra Strayd	Tamzin Merchant	"Mr. & Mrs. Mxyzptlk"	Does not appear	Recurring	Does not appear
Rhea	Teri Hatcher	"Exodus"	Does not appear	Recurring	Does not appear
Lar Gand	Kevin Sorbo		Does not appear	Recurring	Does not appear
Ruby Arias	Emma Tremblay	"Girl of Steel"	Does not appear		Recurring	Does not appear
Morgan Edge	Adrian Pasdar		Does not appear		Recurring	Does not appear
M'rynn J'onzz	Carl Lumbly	"Far From the Tree"	Does not appear		Recurring	Guest
Thomas Coville	Chad Lowe	"The Faithful"	Does not appear		Recurring	Does not appear
Selena	Anjali Jay		Does not appear		Recurring	Does not appear
Imra Ardeen / Saturn Girl	Amy Jackson	"Wake Up"	Does not appear		Recurring	Does not appear
Julia Freeman / Purity	Krys Marshall	"Fort Rozz"	Does not appear		Recurring	Does not appear
Mercy Graves	Rhona Mitra	"The American Alien"	Does not appear			Recurring	Does not appear
Otis Graves	Robert Baker		Does not appear			Recurring	Does not appear
Raymond Jensen / Parasite	Anthony Konechny		Does not appear			Recurring	Does not appear
Mackenzie	Jaymee Mak		Does not appear			Recurring	Does not appear
Baker	Bruce Boxleitner	"Fallout"	Does not appear			Recurring	Does not appear
Lydia Lockwood	Sarah Smyth	"Man of Steel"	Does not appear			Recurring	Does not appear
George Lockwood	Graham Verchere		Does not appear			Recurring	Does not appear
Manchester Black	David Ajala	"Ahimsa"	Does not appear			Recurring	Does not appear
Sarah Walker	Francoise Robertson	"Menagerie"	Does not appear			Recurring	Does not appear
Lex Luthor	Jon Cryer	"O Brother, Where Art Thou?"	Does not appear			Recurring	Does not appear

Main characters

Kara Zor-El / Kara Danvers / Supergirl

Further information: Supergirl (Kara Zor-El)

Melissa Benoist

Kara Zor-El / Kara Danvers / Supergirl (portrayed by Melissa Benoist; season 1–present) is a 24-year-old Kryptonian living in National City, who must embrace her powers after previously hiding them. She assists her adoptive sister, Alex Danvers, as part of the Department of Extranormal Operations (DEO). She discovers the truth that her foster father, Jeremiah Danvers, also worked for the DEO, so they would not take Kara. Alex's co-workers at the DEO help Kara to perfect her powers. Kara has a day job, working as Cat Grant's assistant at CatCo. Kara learns of the existence of metahumans and the multiverse when she befriends Barry Allen, aka the Flash, a superhero from a parallel Earth (Earth-1). Benoist expressed her excitement over portraying the character, and being able to "(tell) a story about a human being really realizing their potential and their strength". Claire Holt and Gemma Atkinson were considered for the role. Malina Weissman and Izabela Vidovic portray a young Kara.

In season two, Kara deals with feuds between Earth's native populace and the extraterrestrial community, and struggles with romantic feelings for Daxamite prince Mon-El. She learns that Superman was formerly a member of the D.E.O., making her his successor within the organization. She becomes friends with Lex Luthor's paternal half-sister Lena, and is targeted by Luthor’s mother, Lilian, leader of Project Cadmus , an organization now dedicated to the exploitation and destruction of all aliens. Kara’s adversaries include Mon-El's mother, Rhea, who wants to retrieve her son, the prince of Daxam, and invade Earth. Kara also becomes a visiting superhero to Earth-1 and a recurring ally of its heroes, including Barry's best friend, Oliver Queen, the vigilante archer Green Arrow.

In season three, Kara deals with the threat of Selena and the Worldkillers, including a new character, Samantha "Sam" Arias/Reign, another refugee from Krypton who is at first unaware of her origins and of her evil persona. Eventually Sam and Reign are physically separated, and Sam destroys Reign at the cost of her own life and others’. Kara travels back in time to save Sam and prevent the sacrifice of Mon-El and of Kara’s mother, Alura, who has survived Krypton. Kara takes the Harun-El (Black Kryptonite) with Sam and Reign into the Fountain of Lilith, taking down Reign. Unbeknownst to her, another Kara appears in the border of Siberia.

• During the "Crisis on Earth-X" crossover, Benoist also portrays Overgirl, her character's fascistic parallel-universe counterpart from the Nazi-ruled world, Earth-X. Other performers include her stunt double Jennifer Clarke. Overgirl is also referred to by Harry Wells and Cisco Ramon as Supergirl-X and Kara-X. The Earth-X Kara Zor-El is married to the Führer of Earth-X, Oliver Queen’s doppelgänger, Dark Arrow. After Overgirl’s heart is damaged, her husband tries and fails to seize Kara's heart to replace it. Overgirl dies, going supernova and exploding in space

In season four, Kara deals with a new wave of anti-alien sentiment from the public, both as Supergirl and as a CatCo reporter. The hostility is secretly orchestrated by Lex Luthor. Kara’s Harun-El-replicated clone, Red Daughter (also portrayed by Benoist), is in the nation Kasnia, where she is being tested and trained by its military forces. It is revealed later that this is part of Luthor's latest scheme to defeat both Supergirl and Superman. Red Daughter has no memories or knowledge of her original, and she sees Luthor as a mentor. She speaks Russian fluently. Kara's clone is eventually betrayed and presumably killed by Luthor after she has completed her part of his plan. When it comes to the fight at Shelly Island, Supergirl fights against Lex Luthor using a special lead suit. Red Daughter sacrifices her life to give Supergirl the opportunity to defeat Lex Luthor.

James Olsen / Guardian

Further information: Jimmy Olsen and Guardian (DC Comics)

Mehcad Brooks

James Olsen (portrayed by Mehcad Brooks; season 1–5) is a former Daily Planet photographer who moved to National City and became the new art director for his former colleague, Cat Grant's media company, CatCo Worldwide Media. He is a potential love interest for Kara. Among his reasons for moving across the country include his breakup with his fiancée, Lucy Lane (with whom he has since reconciled), and keeping an eye on the newly revealed Supergirl for Superman, who considers him a close friend. While working at the Daily Planet, James received the Pulitzer Prize for taking the first photograph of Superman.

In season two, though initially attracted to each other, James and Kara decided that they are incompatible as a couple but remain friends. With Winn's help, James becomes Guardian. He was also named acting CEO of CatCo after Cat Grant took a sabbatical from the company.

In season three, James and Lena Luthor begin a relationship. By the end of season three, James reveals himself to the public as the Guardian.

In season four, James works to help Supergirl when it comes to deal with the Children of Liberty. After CatCo prints a story about the alien march, James is shot by an unseen sniper. It was discovered that the sniper was a thought-to-be-dead Otis who survived the Hellgrammite attack. After being injected with a Harun-El serum, while dealing with a traumatic stress, James begins to developing metahuman abilities similar to Kryptonians'. During the fight against Agent Liberty at Shelly Island, James and Agent Liberty remove the Harun-El serum from each other.

In season five, James is replaced by Andrea Rojas as editor-in-chief of CatCo and quits after refusing to support her sensationalist plans. He later leaves National City to take over his hometown Calvintown's newspaper.

• Brooks briefly portrays a parallel universe version of his character from Earth-X, where he was a member of an underground resistance against the New Reich, the Freedom Fighters. This James Olsen / Guardian is killed by Dark Arrow after a fight.
• In the season four crossover Elseworlds, Brooks portrays the Earth-1 version of Olsen, who works as a bodyguard for Cisco Ramon.

Alex Danvers

Further information: Alex Danvers

Chyler Leigh

Alexandra "Alex" Danvers (portrayed by Chyler Leigh; season 1–present) is Kara's adoptive sister. A brilliant scientist with a past as a party girl, she was hired by Hank Henshaw at the DEO after being arrested for drunk driving, in an effort to turn her life around and see potential in her. As Henshaw's protégée, Alex was personally trained by him in extensive combat, strategic tactics, and investigation after joining the DEO, eventually becoming his right-hand agent in the field. An exceptionally skilled combatant, marksman, tactician, and detective since, Alex tasks herself in providing rigorous training to Kara in order to decrease her reliance on her powers. Initially, like Kara, she becomes suspicious of the DEO and thus her own role upon learning of their father having worked there in order to protect Kara, but Alex ultimately learns that Henshaw is the Martian survivor J'onn J'onzz in shape-shifted disguise, whom her father (who she thought is dead) had rescued before his and the real Henshaw's deaths. After she is arrested and placed in custody for having known about J'onn, she and J'onn escape upon learning that her father is alive at Project Cadmus. She and J'onn are eventually pardoned by the President after they helped save the world from Non's attack with Kara and subsequently rejoin the DEO. Alex also obtains a kryptonite-powered exoskeleton from Non when she was under his mind control to fight Kara, which artificially enhances her strength and endurance when wearing it. She keeps the suit (however using another power source alternative Omegahedron) for later missions.

In season two, Alex realizes her homosexuality and pursues a relationship with National City PD's detective, Maggie Sawyer. She also confides in Sawyer her secret that she is a DEO agent and occasionally works together.

In season three, though Alex and Maggie were engaged to be married, but later they break it off after realizing their incompatibility as a couple, primarily based on Alex's desire to have kids, while Maggie had no yearning to do so. Alex meets Samantha Arias and her daughter Ruby, and envious of Samantha of her motherhood and adores Ruby. She befriends Samantha so that she can be close to Ruby, and hopes one day that she will have her own daughter like Samantha's. Alex had a one-night stand and develops a friendship with Sara Lance, a vigilante associate of Oliver Queen / Green Arrow and leader of the time-traveling superhero team, the Legends, from Earth-1; her encounter with Sara allows Alex to begin moving on from Maggie. She also befriends Barry Allen and Oliver when she arrives to attend the former's wedding with Kara. She joins Earth-1 heroes and Kara to stop Earth-X invaders' scheme against the multiverse, and partnered with Sara when Kara was preoccupied with her villainous parallel universe doppelgänger Overgirl. Her scientific background is also invaluable in helping fellow scientists Harry Wells, Caitlin Snow, Martin Stein, Felicity Smoak, and Barry on Earth-1. Alex learns from Overgirl that she may have her own counterpart on Earth-X when she reveals to Alex that her adoptive sister tried to kill her once, hinting that Overgirl's sister may not aligned herself with the New Reich. Nearing the end of the season, in addition to her exoskeleton, Winn made a prototypical DEO protective suit for Alex, which is filled with advanced gadgetry for her needs in the field. In one episode, Alex made a reference that she worked in a hospital in Seattle before becoming a federal agent (a nod to Leigh's previous role as Dr. Lexie Grey in Grey's Anatomy). In a flashback, it is revealed that ten years previously, Alex first became close to Kara after investigating a murder mystery of their friend from high school together. By the end of season three, Alex becomes the new director of DEO.

In season 4, Alex struggles with her new role as director, and her organization deals with a new wave of anti-extraterrestrial bigotry within the country. During the crossover, "Elseworlds", Kara meets Alex's Earth-1 counterpart, who is intrigued of learning the details of her Earth-38 self's life from Kara. In order to protect Kara from Haley, Alex has J'onn wipe her memory of her knowing that her sister is Supergirl. Though she later regains her memory of this after seeing Supergirl being beaten up by Red Daughter. After Supergirl is resuscitated by the sunlight, Alex gets a call from Colonel Haley about the true purpose of the Claymore satellite. Alex later assists James in fighting Agent Liberty on Shelly Island where she managed to get the Harun-El serum out of James and Agent Liberty.

Jordan Mazarati and Olivia Nikkanen portray a young Alex.

Winn Schott

Jeremy Jordan

Winslow "Winn" Schott Jr. (portrayed by Jeremy Jordan; seasons 1–3) is a tech expert who works alongside Kara at CatCo and serves as one of her allies, helping her develop her costume and aiding her in her adventures as Supergirl. Winn has an unrequited crush on Kara and is rivals with James for her affection, and he later pursued a relationship with Cat's new assistant Siobhan Smythe until she turns into Supergirl's supernatural metahuman archenemy Silver Banshee. In the series, he is the son of Toyman.

In season two, he has left CatCo for a full-time position at the DEO recruited by Alex Danvers and J'onn J'onzz. He and James also become best friends. Winn is responsible for helping James to become the Guardian while he is called the man in the van by James. In addition to remain improving Kara's costume and offers her tech support, Winn also makes his own modifications with her interdimensional extrapolator, a device she received from Earth-1's metahuman inventor Cisco Ramon.

In season three, Winn helps in the fight against the Worldkillers. By the end of season three, Winn is invited to join the Legion of Super-Heroes as he invented the sub-atomic shield and its development saves countless people in the future. Together with Mon-El, he travels into future for saving it, starting his own journey as a hero. During the "Crisis on Earth-X" crossover, an Earth-X version of Winn is introduced. General Winn Schott is the leader of the Freedom Fighters working against the New Reich on his world and thus is Dark Arrow's chief adversary. He is even able to obtain some of Dark Arrow's arsenal (later stolen by Leo Snart for Dark Arrow's Earth-1 doppelgänger Green Arrow) as trophies throughout their fights, therefore implies that Schott is a formidable adversary to the New Reich.

Jeremy Jordan will not return to the series until its fifth season.

J'onn J'onzz / Martian Manhunter

Further information: Martian Manhunter

David Harewood

J'onn J'onzz (portrayed by David Harewood; season 1–present) is the head of the DEO who takes Hank Henshaw's likeness after Henshaw is killed in Peru while hunting J'onn. J'onn takes Henshaw's likeness in order to reform the DEO from within as well as a promise to Jeremiah Danvers to watch over Alex and Kara, who each subsequently trust him as a mentor after learning of his true identity. Prior to his escape from the holocaust on Mars, J'onn was a law enforcement officer to his people. In addition to his powers, J'onn learned various skills and knowledge after living on Earth over decades including martial arts, strategy, investigation tactics, in addition telepathically learned some of Henshaw's memories and knowledge, making him a formidable opponent when in human form without the need of his extraterrestrial abilities and more than capable to run the DEO in Henshaw's place. He takes Alex in as his protégée and forges her as a strong DEO agent, eventually she becomes his right-hand operative. In the episode "Falling", J'onn reveals to the whole world his true identity in order to stop Kara, who is affected by Red Kryptonite, from killing Alex. He is then arrested by the DEO agents who are at the scene, only to escape with Alex upon learning that Jeremiah has survived the attack and that he is being held at Project Cadmus, a facility that experiments with aliens and where he was going to be taken.

In season two, J'onn begins a romantic relationship with a benevolent member of the White Martian race, M'gann M'orzz.

In season three, it is revealed that J'onn's father is alive and they struggle to reconcile of their relationship. His spaceship is disguised as a 1952 vintage Chevrolet Deluxe convertible, in which J'onn, Kara, and Alex love to drive for pleasure. By the end of season three, after he succeeds the memory and knowledge from his father, J'onn leaves the DEO.

In season four, J'onn helps run a support group for aliens trying to integrate into Earth society. He also begins a career as a private investigator. He eschews combat, preferring to provide guidance and mentorship. He warns Kara of a rising wave of anti-alien bigotry. In addition, he starts to go after Manchester Black. During the fight at Shelly Island where they were imprisoned, J'onn and Dreamer use their abilities to overload the core of the satellite before it can be fired on Argo where Superman is.

The evolution of Henshaw was discussed during the filming of the pilot, with the executive producers jokingly saying that Harewood would be a good actor to play the Martian Manhunter in a potential television series, to which DC Comics' Geoff Johns asked why it could not be done in Supergirl. Harewood reflected that he had a difficult time "find[ing] an angle to play Hank Henshaw" in the pilot, and became excited when he was told about the change for his character's backstory.

Hank Henshaw / Cyborg Superman

Main article: Hank Henshaw

Harewood also recurs as the real Hank Henshaw – a former CIA agent and ex-head of the DEO who is ruthless and obsessed with hunting down aliens he believed to be dangerous. He died after he stabbed Jeremiah Danvers in Peru while hunting the alien J'onn J'onzz. He was subsequently found and revived by Project Cadmus, who enhanced him to become the Cyborg Superman.

Cat Grant

Further information: Cat Grant

Calista Flockhart

Cat Grant (portrayed by Calista Flockhart; main season 1; recurring season 2; guest season 3) is the founder and CEO of CatCo Worldwide Media, who feels, since she "branded" Kara as "Supergirl", that she has proprietary custody over the new hero. She was the personal assistant to Perry White prior to being a gossip columnist at the Daily Planet. Cat investigates and reveals that Supergirl is Superman's cousin, which then causes her to become a target for some of Superman's enemies. She also serves as a mentor to Kara, dispensing advice about being a woman in a man's world. In the episode "Hostile Takeover", she begins to suspect that Kara is Supergirl, while the second-season finale reveals she knew Kara was Supergirl all along.

Flockhart became a recurring actress for season two, due to the series' production shift to Vancouver and her desire to take on projects near her Los Angeles home. To accommodate this, Cat decides to take a leave of absence from CatCo, leaving James in charge during the second episode of season two. She returns in the final two episodes to help protect National City from the Daxamite invasion. Flockhart remained a recurring guest star for season three.

In the first episode of season three, it is revealed that Cat has become Olivia Marsdin's Press Secretary.

Mon-El

Further information: Lar Gand

Chris Wood

Mon-El (portrayed by Chris Wood; seasons 2–3) is a survivor and prince of a royal family from the planet Daxam who seeks to become a superhero on Earth. Due to Daxamites being an offshoot of Kryptonians, Mon-El has similar powers to Superman and Supergirl. Mon-El crash lands on Earth in an escape pod at the end of season one. His carefree and somewhat laid-back nature leads to friction with Kara as she mentors him in the ways of being a hero. Mon-El eventually falls in love with Kara and they become a couple. After Kara triggers a weapon that laces the atmosphere with lead dust in order to stop Rhea's Daxamite army, Mon-El is forced to leave Earth.

In season three, it is revealed that Mon-El's pod was sucked into a wormhole and he time-traveled to the 31st century. He was in the future for seven years, where L-Corp administered a serum that gives him immunity to lead poisoning. Despite his love for Kara, Mon-El ultimately marries Imra Ardeen before he returns to the 21st century with her and other passengers for an unknown mission. He is also revealed to be the founder of the superhero team, the Legion.

In season four, Chris Wood's character as Mon-El would no longer appear.

Maggie Sawyer

Further information: Maggie Sawyer

Maggie Sawyer (portrayed by Floriana Lima; main season 2; recurring season 3) is a detective for the National City Police Department who takes a special interest in the cases involving aliens, metahumans, and other extraordinary occurrences. She uses her own experience as a lesbian to help guide Alex as the latter struggles to understand her own sexuality, and the two eventually begin a romantic relationship. However, in season three because Maggie does not want to have children, Alex breaks up with her.

Lima became a recurring actress for season three. She noted the role was only intended to last for one season.

Lena Luthor

Further information: Lena Luthor

Katie McGrath

Lena Luthor (portrayed by Katie McGrath; main season 3–present; recurring season 2) is the CEO of L-Corp (formerly known as Luthor Corp) and the younger paternal half-sister of Lex Luthor. She arrives in National City after Lex has been incarcerated, hoping to rebrand Luthor Corp as a force for good. As the daughter of Lionel Luthor, to whom she is close, Lena tries to redeem her family name after Lex's crimes have tarnished it and to break from her half-brother and step-mother's legacy. Initially, she believed that she was the adopted daughter of the Lionel and Lillian Luthor, but Lena learns that she is actually Lionel's illegitimate child from his extramarital affair. Lena meets Kara after Kara is assigned to interview Lena about L-Corp. Shortly after, the two develop a strong friendship. Later in the season she is taken advantage of by Rhea, under guise of fixing the portal to get her home, but instead brought all the Daxamites to Earth. She is almost married off to Mon-El before the wedding is interrupted and they escape where she then aids her mother and Winn in driving away the Daxamites. Camille Marty portrays a young Lena. McGrath was promoted to series regular for season three.

In season 3, she buys CatCo Media to prevent Morgan Edge from taking it over and decides to run CatCo personally, temporarily handing over control of L-Corp to Sam Arias. Unlike her half-brother, Lena is able to develop a formula to create synthetic Kryptonites. Like Cat Grant, she knows Kara is Supergirl, but has been in complete denial. By the end of season 3, Lena synthesizes the Kryptonian mineral Harun-El in her labortary since it is a form of Black Kryptonite, and starts the phase 2 of her experiment. Lex later invites Lena and Lillian to the White House to watch the destruction of Argo. After an incident at Shelly Island causes Lex to leave, Lena and Lillian fight their way past Lex's henchmen. After Lex teleports to safety upon his armor being destroyed, he arrives in a room where Lena removes the Harun-El from him and shoots him. Before succumbing to his wounds, Lex spitefully reveals to Lena that Kara is Supergirl; leaving her bitter.

In season 5, this perceived betrayal has led Lena to go down a dark path; similar to Lex and Lillian respectively. She buys out CatCo's building so that her old friend Andrea Rojas can run CatCo and keep an eye on Kara while running some simulations with her A.I. Hope. In addition, she also blackbags Eve, Using a miniature device on Eve's head, Lena maps out Eve's brain. Andrea visits Lena voicing her knowledge about Lena's misuse of her products and states that she is cut off. If she ever does anything against her, Andrea will see to it that the next story will expose Lena's experiments. Afterwards, Lena moves on to Plan B where she reveals that she mapped out the loyalty parts of Eve's brain where she uploads Hope into it enabling Hope to control Eve's body.

Samantha Arias / Reign

Odette Annable

Further information: Reign (DC Comics)

Samantha "Sam" Arias/Reign (portrayed by Odette Annable; season 3) is an unknowing Kryptonian survivor sent to Earth by a party of Kryptonian priestesses as an infant prior to its destruction. Sam was adopted by Patricia Arias. Although she grew up without knowledge of her origins, she is sensing that there is something unusual within herself and fears it. Samantha is also a single mother who struggles to raise her daughter Ruby, having distanced herself from her adoptive mother when she became pregnant with her daughter as a teenager. At one point, Sam demonstrated superhuman strength that let her lift a fallen tower off of her daughter Ruby during a terrorist attack; but she believes her strength in the moment was merely derived from epinephrine (adrenaline) and the heightened emotion of distress, and she loses the extra strength immediately after. She works with Lena Luthor, and is promoted to be the acting CEO of L-Corp after Lena Luthor buys CatCo, and later becomes its CFO. She and her daughter also later befriend Alex and Kara Danvers. Throughout the season, Sam forms close friendships with Lena, Alex, and Kara. She finds out from her adoptive mother that she arrived on Earth in a space pod and thus she is an extraterrestrial in origin. Under the pod's key's guidance, Sam travels to a desert that leads to a hidden Kryptonian fortress, where a hologram in the form of one of the dark priestesses, Selena, informs Sam of her heritage and that she is engineered as a "Worldkiller," a living biological weapon of enhanced Kryptonian physiology who was sent to rule Earth; her pregnancy kept her from coming into her powers. Sam was not willing to accept this, but her full powers manifested, awakening her dormant alternative personality Reign. By the end of the season, it is revealed that Selena is Reign's birth mother, therefore is Sam's as well.

After returning home, Sam remains a devoted mother to Ruby with no memories of her actions as Reign, while her Kryptonian alter-ego becomes a black-clad, masked vigilante who indiscriminately kills those she sees as evildoers. However, Reign and two other Worldkillers are each designed to have dissociative identity to keep their existences hidden, yet Sam is stronger than Reign in willpower and control because of her devotion to Ruby, keeping Reign from fully takes over. During her first encounter with Kara's alter-ego Supergirl, Reign battles and defeats her, leaving the superheroine in a coma for days.

After Supergirl emerges from her coma, Reign is at odds with her, the DEO, and the Legion. Reign learned that are more Worldkillers on Earth and seeks to find them. She manages to get Purity on her side when she surrenders to Reign.

Following the deaths of Purity and Pestilence, Reign absorbed their abilities and got away. Reign later targets Ruby to eliminate Sam's will for control, causing Supergirl and Alex Danvers to work in protecting her. Thanks to some Kryptonite, Supergirl, Mon-El, and Kara were able to incapacitate her enough to render her unconscious as they work to find a way to get rid of the Reign side of her. Later, using a mineral from Krypton called the Harun-El, which is a form of Black Kryptonite, they are able to split Sam from Reign. Sam joins the fight against Reign and the dark priestesses after endowing powers that match Reign's. In one timeline, Sam kills Reign, but at the cost of her own life and her allies, but Supergirl travels back in time, and changes the outcome of Reign's defeat and averted the deaths. In the reset timeline, though still defeating Reign by herself, because of another exposure to the Harun-El during the fight, Sam is rid of the Kryptonian side from her, therefore having no powers once more and a chance to again living a normal life with her daughter.

In season four's premiere, it is mentioned that Sam and Ruby have relocated to Metropolis, where Sam is heading L-Corp's northeast sector.

Querl Dox / Brainiac 5

Main article: Brainiac 5

Jesse Rath

Querl Dox/Brainiac 5 (portrayed by Jesse Rath; main season 4–present; recurring season 3) – A hero from the 31st century who arrives in National City to help Supergirl battle Reign. Rath was promoted to series regular for season four.

Ben Lockwood / Agent Liberty

Main article: Agent Liberty

Sam Witwer

Benjamin "Ben" Lockwood/Agent Liberty (portrayed by Sam Witwer; season 4) is a former college professor who became an anti-aliens activist after suffering a series of misfortunes, including the loss of his father, during several alien attacks. With the aid of Mercy and Otis Graves, secretly along with Lex Luthor from prison, Ben becomes a self-proclaimed "Agent of Liberty" and founds a human supremacist group called the Children of Liberty to rid earth of all alien life, including Supergirl. After winning an alien debate against Kara Danvers on national television, Ben is given his very own weekly show named "The Lockdown" whilst secretly operating as the masked Agent Liberty. Ben and his organization go on to kill numerous aliens in National City, including Manchester Black's fiancé Fiona Byrne.

Seeking revenge on Agent Liberty, Manchester Black kidnaps Ben's wife Lydia and tells her about her husband's alter-ego. Ben ultimately manages to free his wife and prepares to execute Manchester, only for Supergirl to intervene and apprehend them both in front of Lydia. Following the announcement that Ben, now publicly exposed as the Children of Liberty's leader, has been taken into police custody, a large crowd of human rights activists with anti-alien sentiments rally outside National City Men's Central Jail to protest Ben's imprisonment. Ben is surprised to see Lydia leading the crowd in chanting "Liberty", and whispers "see you soon" when he notices Supergirl watching him from the sky.

Ben Lockwood is later visited by his son George who starts to get involved with the Children of Liberty. Ben is eventually pardoned by President Baker due to the fact that the Children of Liberty's act of terrorism does not apply to humans and despite the fact that the alien amnesty act, grants all aliens in general the same equal rights as humans.

After being visited by Supergirl about the crashing satellite, Baker later invites Lockwood to the White House where he makes him the Director of Alien Affairs. Lockwood went to where some field leaders of the Children of Liberty are meeting. When one of them challenges Lockwood for the title of Agent Liberty, Lockwood beats him into submission. Afterwards, Lockwood asks the other field leaders if anyone else would like to challenge him. They remain silent and continue accepting him as Agent Liberty.

Following Lydia's death at the hands of one such alien, Ben injects himself with Lena Luthor's experimental serum and gains superhuman abilities to avenge the death of his wife. He has a fight with Brainiac 5 and Dreamer before falling back. When he meets with his son at the church where Lydia's funeral was. George states to his father that his campaign against the aliens is what led to his mom's death which strains Ben's relationship with George.

Ben later learns from Otis about Lex Luthor's plot to redeem himself by betraying the Kaznian invaders. This causes Ben to kill Otis. Due to the experimental serum, Ben's hair starts to fall out. While attempting to take revenge on Lex for manipulating him, he runs into Kara, James and Alex. After a grueling battle, he and James simultaneously stab each other with Lena's Harun-el extractors, removing each other's powers. He is then imprisoned for his crimes where he watches his son on the prison's TV demanding the cooperation of humans and aliens alike.

Nia Nal / Dreamer

Main article: Nia Nal

Nia Nal (portrayed by Nicole Maines; season 4–present) is a transgender woman working at Catco under Kara Danvers.

She was a political speechwriter in Washington, D.C. where she worked for Cat Grant, the White House Press Secretary, under the administration of President Olivia Marsdin. She was sent to National City to be taken under the wing of Kara Danvers / Supergirl to learn the ways of reporting and superheroism.

Lauren Haley

April Parker Jones

Lauren Haley (portrayed by April Parker Jones; season 4) is a United States Marine Corps colonel brought in by President Baker to supervise Danvers.

After Supergirl and Brainiac 5 defeated Agent Liberty and Manchester Black, Haley works to find out who Supergirl is. When she finds out that Supergirl is Kara Danvers, Martian Manhunter uses his abilities to erase her memory of this discovery.

Haley soon starts to doubt President Baker's motives like when a satellite to be used against the aliens nearly crashes which she had no knowledge to when confronted by Alex, making Benjamin Lockwood the Director of Alien Affairs, and declaring Supergirl public enemy #1 after Red Daughter posed as Supergirl and attacked the White House.

When Agent Liberty wanted Haley to summon Supergirl so that the government agents could use their weapons on her, Haley hit the signal watch to summon her. Though Haley secretly hit it twice causing Supergirl not to show up. Haley later contacts Alex to let her know what the Claymore satellite is really being used for. After Lex is killed, Baker is impeached, and Agent Liberty is arrested, Haley is shown to have become the interim Secretary of Alien Affairs.

Kelly Olsen

Kelly Olsen (portrayed by Azie Tesfai; season 5, recurring season 4) is James Olsen's sister. She became part of the main cast for the fifth season.

Eve Teschmacher

Eve Teschmacher (portrayed by Andrea Brooks; main season 5; recurring seasons 2–4) is Cat Grant's and later James' new assistant. When Lena Luthor starts clinical trials at L-Corp and later for the D.E.O. to produce superhuman abilities in humans, Eve joins Lena as her assistant. She is named after a supporting character in the Superman Franchise who worked with Lex Luthor.

She is later discovered to be a mole sent by Lex Luthor. After Lex Luthor is killed, a disguised Eve tries to flee, but is intercepted by an elderly representative of Leviathan who apparently forced her to work with Lex Luthor.

In season five, Eve returns to National City under Leviathan's orders and is blackbagged by Lena. Using a miniature device on Eve's head, Lena maps out Eve's brain. After Andrea cut her off, Lena moves on to Plan B where she reveals that she mapped out the loyalty parts of Eve's brain where she uploads Hope into it enabling Hope to control Eve's body.

Andrea Rojas

Further information: Acrata

Andrea Rojas (portrayed by Julie Gonzalo) is the CEO of Obsidian Tech, an old friend of Lena Luthor, and the new editor-in-chief of Catco Worldwide Media who Kara Danvers and James Olsen dislike.

William Dey

William Dey (portrayed by Staz Nair) is the new star reporter at Catco Worldwide Media.

Recurring characters

This is a list of recurring actors and the characters they portrayed in multiple episodes, which were significant roles. The characters are listed by the order in which they first appeared.

Introduced in season one

Eliza Danvers

Eliza Danvers (portrayed by Helen Slater) is scientist and Kara's foster mother, who is more protective of Kara than she is of her biological daughter, Alex. She is the one to tell Kara and Alex about her husband working with the DEO in order to protect Kara and warns them about Hank as he is not to be trusted because of his involvement in Jeremiah's death. After the revelation that J'onn J'onzz has secretly taken over leadership of the DEO in Henshaw's place, Eliza occasionally offers her scientific expertise for the organization when needed. Slater portrayed Supergirl in the 1984 film and Lara-El in the television series Smallville.

Jeremiah Danvers

Jeremiah Danvers (portrayed by Dean Cain) is a scientist and Alex's biological father and Kara's foster father, who offered his services to the DEO by working with Hank in order to protect Kara. Ten years earlier and under mysterious circumstances, he and Hank went to South America to capture J'onn J'onzz, with whom Jeremiah became friends after the alien saved him. When Hank caught up and saw them shake hands, he tried to kill J'onn, leading to a fight between Jeremiah and Hank while trying to keep Hank from killing J'onzz; Hank then stabbed Jeremiah, who later killed him in self-defense, collapsed on the ground, and was left for dead. He asked J'onzz to watch over his daughters. In the present, J'onn learns that Jeremiah not only survived the attack, but is also alive and being held at Project Cadmus. In season two, Jeremiah is rescued and attempts to reintegrate into his family and the DEO, but eventually betrays them to Cadmus. It is revealed that he made an uneasy alliance with Lillian Luthor in order to protect Alex and Kara from her, and that he has been cybernetically enhanced like Hank Henshaw. He later turns against Cadmus. Cain portrayed Superman in Lois & Clark: The New Adventures of Superman.

Vasquez

Vasquez (portrayed by Briana Venskus) – A DEO agent who often works closely with Hank (J'onn), Alex, and Kara/Supergirl and is responsible for coordinating/relaying information on alien attacks or other incidents.

Alura Zor-El

Alura Zor-El (portrayed by Laura Benanti in season one and two, Erica Durance in season three) is Kara's biological mother who is the twin sister of Astra In-Ze. Alura's guidance (both in flashbacks, and as a Kryptonian Artificial Intelligence which acts as Kara's holographic virtual "mother", whose advice Kara can access in the present day) proves invaluable in Kara's journey. Due to a fail-safe that Zor-El built around Argo City to protect it from Krypton's explosion, Alura is still alive and is part of Argo City's High Council.

It was announced that Erica Durance would take over for Benanti as Alura for the third season, due to Benanti's other commitments.

Durance previously portrayed Lois Lane on Smallville.

Astra In-Ze

Astra In-Ze (portrayed by Laura Benanti) is the aunt of Kara and the twin sister of Alura, who is the main antagonist of season one's arc. She plots to rule the Earth and targets Kara for revenge upon Alura, who was the judge who sentenced her to imprisonment at Fort Rozz, though she claims that she wanted to save Krypton and Earth. Attempting to kill J'onn J'onzz in the episode "For the Girl Who Has Everything", Astra is killed by Alex; thus, Non, her husband, seeks revenge on Kara. It is later revealed that Astra and Non created Myriad, a mind control program that is designed for the purpose of saving environment but can also be used to enslave people, and hence, is the main reason they are sentenced to Fort Rozz for life.

Maxwell Lord

Maxwell Lord (portrayed by Peter Facinelli) is a tech mogul who is fascinated by Supergirl. Lord deduces that Supergirl has a secret identity and is determined to learn it at any cost, becoming her enemy in the process, eventually using Supergirl's connections to Alex and eavesdropping on the latter. After unleashing Bizarro on Supergirl, Maxwell is arrested by Alex and held by the DEO. The DEO eventually releases him, but warns him never to tell anyone the truth about Supergirl or the DEO; otherwise, they will release enough evidence of his crimes to send him to jail. Maxwell later helps Supergirl in stopping Non's attacks, but he later obtains a supply of Kryptonian power source Omegahedron from Sam Lane.

Barry Allen/Flash

Barry Allen/Flash (portrayed by Grant Gustin) is a crime scene investigator from Central City on Earth-1 who becomes a superhero speedster after being hit by dark-matter infused lightning. Barry accidentally arrives in Supergirl's reality after crossing a dimensional barrier while testing a tachyon accelerator with S.T.A.R. Labs, befriends Kara and Winn, and reveals the existences of the multiverse and metahumans to the former and her allies. The Flash helps Supergirl battle against Livewire and the Silver Banshee in addition to offering her advice and support and providing means for Supergirl's Earth's inhabitants to combat their world's surfacing metahuman threats, and eventually returns to his world with Supergirl's help. In season two, Barry and his fellow heroes from his Earth recruit Kara to their universe to help fight against the Dominators, an armada of alien invaders who attack their world due to their fear of superpowered beings. The DEO eventually establishes an alliance with Earth-1's S.T.A.R. Labs after an encounter with the Music Meister. Kara and the DEO have since accessing S.T.A.R. Labs' technology and occasionally teams with Earth-1's heroes on missions. Gustin was the third Glee alum to appear on the show, after Benoist and Jenner, with Criss going on to be the fourth. Gustin reprises his role from The Flash.

Non

Non (portrayed by Chris Vance) is a former scientist in league with the House of El and a brutal Kryptonian military officer who is sinister, powerful, and angry – the antithesis of all things Supergirl stands for and becomes her greatest threat, eventually one of the main antagonists of season one's arc besides Indigo. He is Astra's husband - and hence Kara's uncle - and second-in-command. He seeks revenge on Kara for Astra's death. However, despite his marriage to Astra, Non is not a faithful husband; he had an affair with Indigo at some point prior to being sentenced to the Phantom Zone.

Lucy Lane

Lucy Lane (portrayed by Jenna Dewan) the younger sister of Lois Lane and James' ex-fiancée. In addition to her duties as trial counsel (prosecutor) for the Judge Advocate General's Corps, United States Army (where she held the rank of major), Lucy is a legal attaché on her father's staff, though she resigns her commission in order to remain in National City. She later accepts a job as general counsel for CatCo. In the same episode, it is mentioned that she graduated from the United States Military Academy and earned her J.D./M.B.A. from Harvard Law School. After breaking up with James again, Lucy leaves CatCo and returns to the military. She works with Colonel Jim Harper on the investigation into J'onn J'onzz. However, when Kara reveals to her that she is Supergirl, she helps rescue Hank and Alex, and is later named acting director of the D.E.O. By the end of season one, Lucy officially becomes a co-director with J'onn J'onzz after he returns to the D.E.O.

Leslie Willis / Livewire

Leslie Willis/Livewire (portrayed by Brit Morgan) is a confident, abrasive, and funny shock-jock who works for CatCo and becomes as dangerous and shocking as her words following an accident in which Supergirl rescues her from a potential helicopter crash during a lightning storm. The rescue backfires when Supergirl gets struck by lightning while pulling Leslie out of the helicopter—electrocuting them both and giving Leslie electrical powers. She is captured and given over to the DEO. However, she is later broken out of prison by Siobhan Smythe/Silver Banshee, who wants to team up with her to get revenge on Cat. Along with her new partner, she is defeated by Supergirl again, this time with the help of The Flash and the citizens of National City, and is placed in police custody after The Flash adds new features to the National City Police Department on countering and imprisoning metahuman criminals. In season two, she is taken from prison in an attempt to harvest her power; she is saved by Supergirl, who allows her to escape under a temporary truce. She dies during a fight with Reign.

Sam Lane

Sam Lane (portrayed by Glenn Morshower) is a powerful military general and overprotective father to both Lucy and Lois whose arrival in National City stirs up trouble for Supergirl when he enlists her in a dangerous government initiative.

Kal-El / Clark Kent / Superman

Kal-El / Clark Kent / Superman (portrayed by an uncredited Kevin Caliber in season one, Tyler Hoechlin from season two onward) is a superhero from the planet Krypton who defends Metropolis. He was only shown briefly during season one having found Kara and only communicated via chat messaging. Daniel DiMaggio appears as an alternate, teenage version of the character in a dream sequence. Near the end of season one, Superman proves vulnerable to Myriad's mind control, as Maxwell Lord put it "watched Sesame Street and went to preschool; nurture over nature". This leaves him unconscious in the D.E.O. until the last episode, where he wonders if the headache he is having is what a hangover is like. He comes to National City at the beginning of season two to help Kara out in dealing with Project Cadmus and Metallo before leaving to return to Metropolis, vowing to return if Kara needs it. At the end of season two, Rhea uses silver Kryptonite to compel him to fight Kara, who is forced to knock him out. After he recovers from the Kryptonite, he helps Kara repel Rhea's invasion fleet.

In season four, after meeting Barry Allen and Oliver Queen in the "Elseworlds" crossover event- during which he assists in destroying the rogue A.M.A.Z.O. robot and defeating Doctor John Deegan after Deegan tries to turn himself into a black-suited Superman to be a "hero" - Clark reveals that he and Lois are relocating to Argos City after learning that Lois is pregnant to ensure her safety during the pregnancy, Clark assuring Kara that he has faith that she can cope with her current challenges on Earth despite the rising anti-alien sentiment. Clark later proposes to Lois while on the way to Argo City. Lex later planned to use Claymore on Argo in order to destroy Superman only for Martian Manhunter and Dreamer to overload its core.

Siobhan Smythe / Silver Banshee

Siobhan Smythe / Silver Banshee (portrayed by Italia Ricci) is a new hire at CatCo Worldwide Media who clashes with Kara and later Supergirl. She briefly becomes Cat's top assistant, and has her sights set on becoming a media mogul in her own right. She has already attracted the attention of Winn, while discovering that her father had been involved in an affair upon learning he was a member of an Ashley Madison-esque website that is exposed by Indigo. When she sees a video of Supergirl (under the influence of Red Kryptonite) letting an alien get away, she tries to pitch it to Cat, and then tries to sell it to Cat's former employer, Daily Planet. When Cat finds this out, she fires Siobhan for her disloyalty. After another attempt to gain revenge on Kara fizzles, she discovers that she has the power to sonic scream. Upon learning that the women of her family are taken over by a banshee's spirit whenever they are wronged, Siobhan decides to get even with Cat and Kara by teaming up with Livewire; in the process, she embraces her curse for the powers it provides and becomes Silver Banshee. In addition to her hypersonic ability, the Silver Banshee's strength and endurance are on par with Supergirl's after her powers increased and is implied that she would have other abilities. Despite hating Kara, Siobhan chooses not to kill her, knowing that she would break her curse and lose her powers if she does until someone wronged her once more. Ironically, not knowing that Supergirl is Kara, and if the Silver Banshee kills the superhero, she would become a regular human again. She is later defeated by Supergirl and the Flash, along with Livewire, and both she and her partner are imprisoned in metahuman cells provided by the Flash.

Indigo

Indigo (portrayed by Laura Vandervoort) is a living computer, formerly known as Brainiac 8, sentenced to Fort Rozz for turning against the people of Krypton, but now unstoppable on Earth. She serves as one of the main antagonists of season one's arc besides Non. It is revealed that she was the one who hijacked Kara's pod and connected both the pod and Fort Rozz that brought them to Earth, and also that she despises Astra. After Kara and Winn defeat her and she disintegrates, Non recreates Indigo in order to do his bidding. Indigo is permanently destroyed by J'onn J'onzz during Non's attempt to conquer Earth.

Vandervoort previously portrayed Supergirl in the series Smallville.

Introduced in season two

Lex Luthor

Lex Luthor (portrayed by Jon Cryer as an adult, Aidan Fink as a boy) – Lillian's son and Lena's half-brother. He later serves as a main antagonist of season four's arc. Years ago, Lex created a red sky over Metropolis to take down Superman but was caught and sent to prison. In the present, it is revealed that Lex secretly watches and orchestrates a series of events including Ben Lockwood's leadership to Children of Liberty and Red Daughter's alignment with the rogue nation Kasnia. He is later freed from prison due to a disease. Lena decides to help Lex by working on a cure. Lena exposes Lex of cutting off the backup power which he agrees to he did and that he sent a thought-to-be-dead Otis to shoot James so that Lena would have no choice but to test the cure (a Harun-El serum) on him. It is also revealed that Eve was working with Lex and Otis. Lex puts Lena to sleep leaving Eve to look after her. Lex escapes with Otis, but is stopped by Supergirl. Lex later develops metahuman abilities similar to Kryptonians' in strength and invulnerability after his Harun-El injection. After teleporting to safety when his armor was destroyed by Supergirl on Shelly Island, Lex is hit with the Harun-El antidote and then shot by Lena. Before dying of his wound, Lex spitefully reveals to Lena that Kara is Supergirl and that Alex and those who worked with her kept the information from her. Lex's corpse is later approached by the Monitor. Fink portrays the character as a boy in flashback sequences in "Luthors".

Cryer previously portrayed Lex's nephew Lenny in Superman IV: The Quest for Peace.

Lillian Luthor

Lillian Luthor (portrayed by Brenda Strong) is the leader of Project Cadmus, Lex Luthor's mother, and Lena Luthor's step-mother, and is the secondary antagonist of season two's arc. She and her team were the ones responsible for turning John Corben and Hank Henshaw into Metallo and Cyborg Superman respectively. After Metallo had an encounter with Supergirl and Superman, Project Cadmus eventually reveals that it has gone rogue, and is waging war against all alien life on Earth. Lillian is arrested after a failed attempt to wipe out all aliens in National City with a Kryptonian bioweapon but is later freed by Metallo. Lillian is estranged from Lena since her husband favors her over their son, and blamed Lena's mother for the deterioration of her relationship with Lionel. During the Daxamite invasion, she briefly allies with Kara in order to rescue Mon-El and Lena from Rhea, and helps Lena and Winn prepare a weapon that will disperse lead in Earth's atmosphere to drive away the Daxamites. Lillian later targets Morgan Edge after he poisoned Lena which leads to both of them being defeated by Supergirl and Jimmy Olsen and arrested by the authorities.

In season four, Lena has her mother placed on work release when it came to developing the antidote for the Harun-El. Lillian and Lena are later invited to the White House by Lex to watch the Claymore satellite destroy Argo.

Snapper Carr

Snapper Carr (portrayed by Ian Gomez) is a newsman hired by Cat Grant to be the editor-in-chief of CatCo Magazine. A hard-nosed old-school newspaper reporter/editor, Carr is initially hostile to Kara when Cat assigns her to become a reporter under him, and also towards Olsen when James takes over Cat's job.

Olivia Marsdin

Olivia Marsdin (portrayed by Lynda Carter) was the President of the United States. It is revealed that she is a Durlan, after she signs a bill granting amnesty for aliens living incognito in the U.S., prior to which she survives two assassination attempts. A benevolent alien refugee who escaped her home planet Durla as a child after an invasion, Olivia seeks to protect both other refugees and people of Earth from alien attacks and other threats due to her experience, and therefore she hates invaders.

In season four, Mercy and Otis Graves publicly expose Olivia as an alien which causes her to resign. This enables Vice-President Baker to be sworn in as the new President of the United States.

Carter previously portrayed the eponymous character of the 1970s Wonder Woman television series.

M'gann M'orzz / Miss Martian

M'gann M'orzz / Miss Martian (portrayed by Sharon Leal) is a guilt-ridden White Martian who disguises herself as a Green Martian, forsaking her race's heritage. She tends bar at an underground bar for aliens in National City. M'gann gradually earns J'onn J'onzz's trust and friendship after he discovers her true identity, and learns that she is benign and an outcast from her own people. When J’onn discovers this he places M’gann in a cell where she later has a physic attack. J’onn saves her by mentally connecting. In the next episode M’gann meets her former mate, and assists J’onn and the DEO in capturing him. Despite she and J'onn realizing they have romantic feelings for each other, M'gann chooses to return to Mars to search for other White Martians who are also against their race's savage legacy in hopes of ending it. M'gann later return to Earth in the season 2 finale with other benevolent White Martians to help J'onn repel the Daximite invasion. She reveals to J'onn that there is a secret party within the White Martians' society who seeks to overthrow tyranny. It is also when she and J’onn first kiss. In season three episode three M’gann calls J’onn to Mars to help her and other White Martians save his father.

Lyra Strayd

Lyra Strayd (portrayed by Tamzin Merchant) is an alien from the planet Starhaven who takes a romantic interest in Winn.

Demos

Demos (portrayed by Curtis Lum) is a member of the D.E.O. He later sacrifices his life in an attempt to keep Selena's followers from getting the corpses of Purity and Pestilence.

Rhea

Rhea (portrayed by Teri Hatcher) is the Queen of Daxam and Mon-El's mother, who is the main antagonist of season two's arc. She and Lar Gand journey to Earth in search of Mon-El. She is utterly determined to take Mon-El back to Daxam with her. She tricks Lena Luthor into helping her build a transporter to bring a Daxamite fleet to conquer Earth. Rhea fights Kara in a one-on-one duel for the fate of Earth, but refuses to halt the invasion despite losing, and is killed when Kara activates a weapon that laces Earth's atmosphere with lead dust. Prior to her, death, Mon-El reveals to his mother that he knows that she killed his father all along due to his awareness of her immorality, and thus he will grieve over his father but not her.

Hatcher previously portrayed Lois Lane in Lois & Clark: The New Adventures of Superman and played as Ella Lane in Smallville.

Lar Gand

Lar Gand (portrayed by Kevin Sorbo) is the King of Daxam and Mon-El's father. He and Rhea journey to Earth in search of Mon-El. After he agrees to let his son remain on Earth, he is killed by Rhea, who views his decision as a betrayal. Despite Rhea lying to her son that Lar killed himself, Mon-El knows that his father was not suicidal and realizes that his mother murdered him.

Introduced in season three

Ruby Arias

Ruby Arias (portrayed by Emma Tremblay) is Samantha's daughter who is a smart, independently minded child fascinated by Supergirl.

In season four, it is revealed that Ruby and her mother relocated to Metropolis.

Morgan Edge

Morgan Edge (portrayed by Adrian Pasdar) is an amoral real estate developer who is at odds with Kara and Lena.

M'yrnn J'onzz

M'yrnn J'onzz (portrayed by Carl Lumbly) is J'onn J'onzz's father and another Green Martian survivor who is a pacifist religious leader on Mars. He comes to Earth to live with J'onn, and begins to suffer from a form of dementia which causes him to lose control of his mental powers. Lumbly has previously voiced J'onn J'onzz in various animated works.

Thomas Coville

Thomas Coville (portrayed by Chad Lowe) is the leader of a religious group that worships Supergirl. Lowe also serves as director for some episodes. Coville later had the religious group worship the Worldkillers and is later killed by Selena after he served his purpose.

Imra Ardeen / Saturn Girl

Imra Ardeen / Saturn Girl (portrayed by Amy Jackson) is a hero born on Saturn's moon Titan who has telekinetic abilities. She is Mon-El's wife and Kara's romantic rival.

Julia Freeman / Purity

Julia Freeman / Purity (portrayed by Krys Marshall) is a musician residing near National City who, like Reign and Pestilence, is a Worldkiller. She and Pestilence later take each other out in a mutual kill and have their powers absorbed by Reign.

Grace Parker / Pestilence

Grace Parker / Pestilence (portrayed by Angela Zhou) is a doctor in National City who, like Reign and Purty, is a Worldkiller. However, unlike them, Parker is sociopathic and embraces her Worldkiller alter-ego, therefore her personas accept each other as one. She and Purity later take each other out in a mutual kill and have their powers absorbed by Reign.

Selena

Selena (portrayed by Anjali Jay) is an evil Kryptonian priestess and the main antagonist of season three's arc, who originally appears as a holographic mentor to the Worldkillers and a member of the Worldkiller Coven. Her coven is responsible for creating Reign and she personally refers to her as her daughter, therefore revealing that Selena is Reign's biological mother. It is later revealed she survived Krypton's destruction and is a member of Argo City's High Council. Selena schemes to perform a ritual that will terraform Earth into a Krypton-like planet upon studying the prophecy from the Book of Rao.

Introduced in season four

Mercy Graves

Mercy Graves (portrayed by Rhona Mitra) is a former Project Cadmus agent alongside her brother Otis Graves. Similar to her Superman: The Animated Series counterpart, Mercy was also head of security for what was then known as Luthor-Corp under Lex Luthor's reign; she resigned from her post due to her boss's obsession with Superman, feeling he wasn't seeing the bigger picture. When Lillian Luthor was arrested, she and Otis began working with Agent Liberty and the Children of Liberty. Both of them were seemingly killed by a Hellgrammite; Otis reappears in the employ of Lex Luthor.

Otis Graves

Otis Graves (portrayed by Robert Baker) is the brother of Mercy Graves who is loosely based off Otis from the 1978 film. Unlike his more professional sister, Otis has a more childish, sadistic streak as demonstrated when he tortures Dr. Rohan Vose for fun, to Mercy's disapproval. When Lillian Luthor was arrested, he and Mercy began working with Agent Liberty and the Children of Liberty. Both of them were killed by a Hellgrammite.

Otis turns up alive, having been resurrected by Eve Teschmacher. When Supergirl and Lena Luthor found information in Lex Luthor's cell, Otis was told to go into a location and stand there as Otis explodes. Lex then has Otis put back together. Ben later visits Otis where he unknowingly tells him of Lex Luthor's plot to look like he reformed. This causes Ben to kill Otis.

Raymond Jensen / Parasite

Raymond Jensen (portrayed by Anthony Konechny) is a D.E.O. agent that sided with the Children of Liberty. Following the deaths of Mercy and Otis, Agent Liberty subjected Jensen to an experiment that involved placing an Angon alien parasite inside him. When he absorbs the lifeforce of anyone, they become withered. In the case of aliens, he can absorb their abilities.

Mackenzie

Mackenzie (portrayed by Jaymee Mak) is a reporter for CatCo Worldwide Media.

Phillip Baker

Phillip "Phil" Baker (portrayed by Bruce Boxleitner) started out as the Vice President of the United States under president Olivia Marsdin. After Marsdin resigns upon the Children of Liberty exposing her as a Durlan, Baker is sworn in as the new president of the United States. He later appointed Lauren Haley to oversee the D.E.O.; unlike Olivia, he is a selfish man who cares more about his approval ratings than he does about the welfare of his country and morality, although he nonetheless opposes the Children of Liberty.

Following the arrests of Agent Liberty and Manchester Black, Baker appeared at D.E.O. headquarters after seeing the news. He ordered Supergirl to reveal her secret identity to the public so it would not affect his approval ratings anymore, but she refused since it would endanger her loved ones. Baker has Supergirl dismissed from the D.E.O.'s services hoping she will come around.

Baker later makes an example of Menagerie and has her incarcerated. He also pardons Ben Lockwood of his crimes; to improve his poll ratings.

Supergirl later attempts to persuade president Baker not to do a missile launch towards any spaceship that approaches Earth. Following Supergirl's fight with the Elite, she confronts Baker about the satellite that nearly crashed. She states that she was able to prevent everyone including Baker's loved ones from dying before leaving. Baker later invites Lockwood to the White House where he makes him the Director of Alien Affairs; after an unpleasant encounter with Supergirl.

In light of the alien peace march, Baker and Lockwood are left to hold inquiries about the alien amnesty bill's fate.

When Baker repeals the Alien Amnesty Act, Red Daughter disguised as Supergirl attacks the White House, he declares Supergirl public enemy #1 much to the dismay of Alex and Haley.

After Supergirl and Lena Luthor escaped from a lab that Otis exploded in and the fact that Supergirl didn't show up at the DEO headquarters, President Baker had no choice but to deputize the Children of Liberty.

At some point, Baker has Kryptonite installed in his office in order to protect against further attacks from Red Daughter who Baker still mistook for Supergirl. In her civilian guise, Kara meets with Baker to present evidence that Lex Luthor is conspiring with Kaznia to attack the US. Baker takes the evidence and asks Kara whether anyone else knows of her discovery. When she says no, Baker has her black-bagged. It is revealed that Baker has been working with Lex Luthor the whole time. After Lex Luthor "kills" Red Daughter on TV, Baker states that Lex Luthor killed Supergirl and claimed that she was the mastermind of the Kaznian attack.

After the blog written by Kara exposes Lex Luthor's crimes following the fight at Shelly Island, Baker is impeached by congress and arrested for his involvement with Lex. This causes Vice-President Plastino to be sworn in as the acting president until re-elections can be held again with Plastino's first act being the reinstatement of the Alien Amnesty Act.

NOTE: Brent Spiner was originally cast as Baker, but had to step down due to a family emergency. As a result of this, the role was recast to Bruce Boxleitner.

Lydia Lockwood

Lydia Lockwood (portrayed by Sarah Smyth) is married to Ben Lockwood and the mother of George Lockwood. She is killed in the episode "American Dreamer" when an alien invades Ben Lockwood's home in reprisal for his actively participating in alien detentions.

George Lockwood

George Lockwood (portrayed by Graham Verchere) is the son of Ben and Lydia Lockwood. As a teenager living through chaotic circumstances, George was the first to begin parroting his grandfather's xenophobic rhetoric, which only gets worse with his father's indoctrination. He briefly leads the Children of Liberty as a figurehead while his father is in custody, helping with the initial defeat of Menagerie, before Ben is pardoned and retakes command. After finding out that one of his friends was an alien, he starts to reconsider helping his father. After his Mom was killed, George blames his dad for his campaign against aliens leading to his mother's death and vows that he won't forgive him which strains his relationship with his dad. Following the arrest of Agent Liberty, George appears on TV asking for humans and aliens to cooperate with each other while stating that people like his father tried to keep them apart.

Manchester Black

Manchester Black (portrayed by David Ajala) is a man who fell in love with an Empath from Ikthanol named Fiona Byrne. After she was captured by the Children of Liberty, Manchester worked with Martian Manhunter to find her. When they find a badly-wounded Fiona in Mercy and Otis's van, Manchester had his final moments with a dying Fiona as Martian Manhunter tries to heal her. Following Fiona's death, Manchester went to buy guns in order to get revenge on those responsible for Fiona's death. After a shootout with some Children of Liberty members, Manchester tortures a surviving member on the identity of his superior. The unidentified Children of Liberty member states that he took orders from Caldwell as Manchester shoots the unidentified Children of Liberty member (off-screen). Manchester proceeded to target Caldwell where he massacred him and the Children of Liberty members with him after getting the information about Ben Lockwood. After holding Lydia Lockwood hostage, Manchester faced off against Ben Lockwood until they were stopped by Supergirl and Nia Nal. Afterward, Manchester and Ben were arrested by the police. He was briefly visited by Martian Manhunter in National City Men's Central Jail before witnessing Ben Lockwood being incarcerated.

Manchester Black later escapes from prison and forms the Elite with Menagerie, Hat, and an unnamed Morae in his plans to get revenge on Ben Lockwood and the Children of Liberty.

Supergirl and Martian Manhunter continue investigating Manchester who confronts the two by using a staff that triggers J'onn's memeories to come back. Just before Lena Luthor and Kelly Olsen can use the cure on Jimmy Olsen so that they can see if it can work on a dying Lex Luthor, Manchester causes a power outage across the city. Supergirl and Martian Manhunter confront Manchester again. Martian Manhunter kills Manchester while Kara stops the city from being flooded.

Sarah Walker

Sarah Walker (portrayed by Françoise Robertson) is the White House Chief of Staff under president Phil Baker.

Malefic J'onzz

Malefic J'onzz (portrayed by Marcello Guedes as a boy, Domonique Robinson as a teenager, voiced by Phil LaMarr) - A Green Martian and brother of J'onn J'onzz who was brought to Earth from the Phantom Zone by the Monitor and begins his plans to get revenge on J'onn. He starts by freeing Midnight from the Phantom Zone. With help from Obsidian Tech, J'onn figures out that Malefic betrayed the Green Martians to the White Martians and used a death curse on some of them which led to Malefic being banished to the Phantom Zone.

Guest stars

The following is a supplementary list of guest stars, some recurring, who appear in lesser roles. The characters are listed in the order in which they first appeared.

Introduced in season one

• Zor-El (portrayed by Robert Gant) – Kara's biological father.
• The Commander (portrayed by Faran Tahir) – An alien military expert who leads the forces aligned against Supergirl.
• Vartox (portrayed by Owain Yeoman) – An alien convict who has been hiding on Earth for the past twelve years and seeks a battle with Supergirl after she emerges, using the attempted plane crash that Kara aborted in order to draw her out. He commits suicide after Kara defeats him in their rematch before he could destroy National City.
• Hellgrammite (portrayed by Justice Leak) – An unnamed alien escapee from Fort Rozz who feeds on DDT and is from the same alien race of the same name. He is later killed by Alex. Based on the DC Comics character of the same name. Another Hellgrammite appears in season 4 as an alien controlled by the Children of Liberty who is made to attack a carnival. He is defeated by Supergirl, Alex, and Guardian who free him from his possession. After killing Mercy and Otis Graves as payback and for their anti-alien plans, the Hellgrammite surrenders peacefully.
• Ben Krull / Reactron (portrayed by Chris Browning) – A former nuclear physicist and an enemy of Superman who decides to get revenge on him by trying to kill Supergirl as payback for his wife's death.
• Carter Grant (portrayed by Levi Miller) – The son of Cat Grant, he is sensitive and shy and has a crush on Supergirl, which he confesses to Kara when she babysits him.
• T. O. Morrow (portrayed by Iddo Goldberg) – A brilliant scientist. Morrow later reprograms Red Tornado to kill Kryptonians and both are defeated by Alex and Kara, respectively.
• Red Tornado (voiced and motion-captured by Iddo Goldberg) – An android designed as the ultimate super-weapon that gains sentience.
• Katherine Grant (portrayed by Joan Juliet Buck) – Cat Grant's mother, whom Cat has despised due to her failure to recognize her daughter's success. Even Kara can barely stand to be in Katherine's presence for too long.
• Jemm (portrayed by Charles Halford) – An alien prisoner who uses the gemstone embedded in his forehead to manipulate people's emotions and behavior. He is a conqueror of 12 planets, for which he was also convicted.
• Bizarro (portrayed by Hope Lauren) – A mirror image of Supergirl, loosely based on the Bizarro Superman. Lord creates her by infusing a comatose Jane Doe with Kara's DNA and black blood cells, and orders her to destroy Supergirl after learning the latter's true identity. With the exception of fire breath and freeze vision, her powers are identical to those of Supergirl. She is defeated by Kara after the DEO injects her with blue kryptonite and placed back in a comatose state at the DEO headquarters. Regular kryptonite will only strengthen Bizzaro.
• Winslow Schott Sr. / Toyman (portrayed by Henry Czerny) – A mad criminal genius and Winn's estranged father who weaponizes toys to wreak destruction, as he seeks revenge on his former boss for stealing his ideas, which led Winslow to send a bomb to his workplace at the cost of six lives, excluding his boss, who survived because the secretary opened to package by accident. He wants nothing more than to repair the bond between himself and Winn, but is seen as insane and unlikeable by his son. Toyman later dies in prison and is succeeded by Jacqueline Nimball.
• Cameron Chase (portrayed by Emma Caulfield) – An FBI agent.
• Adam Foster (portrayed by Blake Jenner) – Cat Grant's eldest son and thus Carter's half-brother. He serves as Kara's potential love interest and thus another rival for James and Winn. Jenner was the second Glee alum to appear on the show, after Benoist, his then-wife. Gustin and Criss would later be the third and fourth, respectively.
• Miranda Crane (portrayed by Tawny Cypress) – A senator who uses her anti-alien beliefs to gain votes, but is forced to turn to Supergirl for help when her visit to National City is interrupted by an alien attack. She is kidnapped by the White Martian, who poses as Crane in order to kill the Martian Manhunter until Supergirl helps the latter avert it before it goes further. The real Crane apologizes and vows to help make peace with humans and aliens.
• Detective Draper / Master Jailer (portrayed by Jeff Branson) – A third-generation guard at Fort Rozz who turns vigilante after learning that many of its inmates were loose on Earth. He is bent on chasing down the escapees and bringing them to justice, believing that he is judge, jury, and executioner on Earth, even if the criminals were convicted of lighter crimes. He poses as a National City detective to get information on the escapees' whereabouts.
• James Harper (portrayed by Eddie McClintock) – A colonel for the United States Marine Corps who leads the investigation of Hank Henshaw / J'onn J'onzz's affair alongside Lucy Lane.
• Maxima (portrayed by Eve Torres Gracie) – Another alien prisoner who is the queen of the planet Almerac and once attempted to make Superman her mate. She attempts to escape with the help of the D.E.O. agents including Lucy Lane (under the influence of Myriad) before Kara manages to stop her.

The hosts of The Talk, Sara Gilbert, Julie Chen, Sharon Osbourne, Aisha Tyler and Sheryl Underwood, cameo as themselves.

Introduced in season two

• John Corben / Metallo (portrayed by Frederick Schmidt) – An international assassin who is transformed into a cyborg by Project Cadmus after he is badly injured trying to kill Lena Luthor. He is later killed after the Kryptonite that was infused into his body turned him into a living bomb.
  • Schmidt later return voicing the Earth-X counterpart of his character in the crossover "Crisis on Earth-X" as a member of the New Reichsmen; the Earth-X's Metallo's mission is to subdue Supergirl for Dark Arrow and Overgirl, but is later killed by the combined effort of Earth-1 and Earth-X's heroes.
• Gilcrist / Metallo (portrayed by Rich Ting) – A doctor working at Cadmus, who becomes a second Metallo alongside Corben.
• Scorch (portrayed by Nadine Crocker) – A pyrokinetic alien who attempts to assassinate President Marsdin.
• Veronica Sinclair / Roulette (portrayed by Dichen Lachman) – The operator of an underground alien fight club in National City, who later becomes a human trafficker for an alien slave trade.
• Draaga (portrayed by John DeSantis in season two; Glenn Ennis in season three) – A combatant in Roulette's underground fight club in National City. He is seen fighting Supergirl who after losing to him in the first battle came back to defeat him upon learning from Mon-El (who mentioned that he crossed paths with his race on several occasions) that he has a weak spot in his leg.
• Rudy Jones / Parasite (portrayed by William Mapother) – A scientist working on solving climate change that is fused with an alien parasite, giving him the ability to absorb powers or a person's life. Jones began killing senators who were stopping attempts at researching climate change, as well as mutating into a purple creature resembling the Flukeman after absorbing J'onzz and Kara's powers. Jones is eventually killed when Kara forces him to absorb a radioactive isotope.
• Phillip Karnowsky / Barrage (portrayed by Victor Zinck Jr.) – A former Navy SEAL who eventually became a vengeful vigilante after the murder of his wife.
• Cisco Ramon / Vibe (portrayed by Carlos Valdes) – A member of the Flash's team at S.T.A.R. Labs in Earth-1, who is a metahuman with the abilities to detect anomalies within reality, emit sonic manipulations and open breaches between worlds. Cisco is also an inventor who made various arsenal and gadgetry for heroes including Kara, who made her an extrapolator for interdimensional communications and travels. Valdes reprises the role from The Flash.
• Izzy Williams (portrayed by Harley Quinn Smith) – A young woman who is kidnapped and transported to the planet Maladoria by Veronica Sinclair as part of a slavery smuggling ring.
• Lionel Luthor (portrayed by Ian Butcher) – Lillian Luthor's estranged husband, and Lex and Lena Luthor's father.
• Mister Mxyzptlk (portrayed by Peter Gadiot) – An impish, reality-bending trickster from the 5th Dimension. He attempts to force Kara to marry him, but is banished back to the 5th Dimension when she tricks him into spelling his name backwards.
• Mandrax (portrayed by Paul Lazenby) – An alien art smuggler who was a prisoner at Fort Rozz.
• Music Meister (portrayed by Darren Criss) – An extra-dimensional being with the ability to hypnotize people with his eyes, sending them into a self-created dream world, and allowing him to syphon their abilities. Criss was the fourth Glee alum to appear on the show, after Benoist, Jenner, and Gustin.
• Jack Spheer (portrayed by Rahul Kohli) – The CEO of Spheerical and Lena's ex-boyfriend, who has created a new nanotechnogical medical solution known as Biomax.
• Marcus (portrayed by Lonnie Chavis) – A young alien who bonds with James Olsen.
• General Zod (portrayed by Mark Gibbon) – Superman's most feared enemy. He appears only in Superman's silver kryptonite-induced hallucinations. Though it was mentioned that Superman killed him, he was somehow revived in the 30th Century.

Introduced in season three

• Gayle Marsh / Psi (portrayed by Yael Grobglas) – A metahuman psychic who uses people's minds against them.
• Oscar Rodas (portrayed by Carlos Bernard) – Maggie Sawyer's estranged father and a police officer.
• Patricia Arias (portrayed by Betty Buckley) – Samantha Arias's adoptive mother, who is estranged from her daughter after she became pregnant with Ruby as a teenager. She was later stabbed by Reign and died from her injuries in D.E.O. custody.
• Olivia (portrayed by Sofia Vassilieva) – A woman who became a member of Thomas Coville's Cult of Rao. She later came across a Krpytonian artifact that when in her hands would make her a Worldkiller. When it is unable to be removed from Olivia, Supergirl used her heat vision to warm it enough for it to come out of her hand and then used her freezing breath to cool Olivia's hand.
• Oliver Queen / Green Arrow (portrayed by Stephen Amell) – A former billionaire playboy turned mayor of Star City on Earth-1 who operates as a hooded-bow wielding vigilante Green Arrow. He is a close friend and ally of the Flash and who befriends Kara. Amell reprises his role from Arrow.
  • Oliver Queen / Dark Arrow (portrayed by Stephen Amell) – Oliver's Earth-X counterpart and Overgirl's husband.
• Professor Martin Stein / Firestorm (portrayed by Victor Garber) – A member of the Legends who is a nuclear physicist and also half of the character Firestorm with Jefferson Jackson. Garber reprises his role from Legends of Tomorrow.
• Joe West (portrayed by Jesse L. Martin) – Iris' father and member of Central City Police Department. Martin reprises the role from The Flash.
• Felicity Smoak / Overwatch (portrayed by Emily Bett Rickards) – An I.T. expert, associate and wife of Oliver Queen. Rickards reprises her role from Arrow.
  • Rickards also portrays the unnamed Earth-X version of the character, who is interned in a concentration camp under the Nazi regime.
• Sara Lance / White Canary (portrayed by Caity Lotz) – A former member of the League of Assassins and leader of the Legends. Lotz reprises her role from Legends of Tomorrow.
• Harrison "Harry" Wells (portrayed by Tom Cavanagh) – A member of Team Flash from Earth-2. Cavanagh reprises his role from The Flash.
  • Eobard Thawne / Reverse-Flash (portrayed by Tom Cavanagh) – A rogue time-traveling speedster and Barry Allen's nemesis from Earth-1's distant future, Thawne reveals that he has also encountered Superman at some point in the future. Cavanagh reprises his role from The Flash.
• Mick Rory / Heat Wave (portrayed by Dominic Purcell) – A member of the Legends and former criminal equipped with a gun that capable of burning almost everything. Purcell reprises his role from The Flash and Legends of Tomorrow.
• Iris West (portrayed by Candice Patton) – Barry Allen's fiancé and associate. Patton reprises her role from The Flash.
• Jefferson Jackson / Firestorm (portrayed by Franz Drameh) – A member of the Legends and the other half of the character Firestorm with Martin Stein. Drameh reprises his role from Legends of Tomorrow.
• Caitlin Snow / Killer Frost (portrayed by Danielle Panabaker) – A bioengineering expert from S.T.A.R. Labs and a metahuman with cryokinetic abilities. Panabaker reprises her role from The Flash.
• Wally West / Kid Flash (portrayed by Keiynan Lonsdale) – Iris' brother with similar abilities as Barry Allen. Lonsdale reprises his role from The Flash.
• David Singh (portrayed by Patrick Sabongui) – The police captain of the Central City Police Department in Earth-1. Sabongui reprises his role from The Flash.
• Clarissa Stein (portrayed by Isabella Hofmann) – The wife of Martin Stein in Earth-1. The character was first introduced in The Flash
• Professor Lily Stein (portrayed by Christina Brucato) – The daughter and scientific colleague of Martin Stein who is a nanotechnologist in Earth-1. The character was first introduced in The Flash
• Cecille Horton (portrayed by Danielle Nicolet) – Joe West's girlfriend in Earth-1. The character was first introduced in The Flash.
• Nora West-Allen (portrayed by Jessica Parker Kennedy) – A mysterious girl with super-speed. She was first seen at the wedding of Barry Allen and Iris West before Dark Arrow's forces crashed it. She later appeared in The Flash where she introduces herself as the future version of Barry Allen and Iris West's daughter.
• Jindah Kol Rozz (portrayed by Sarah Douglas) – A disgraced Kryptonian priestess imprisoned at Fort Rozz who has vital information about the esoteric cult that Reign is from. Douglas portrayed another Kryptonian criminal Ursa in Superman (1978) and Superman II (1980).
• Mrs. Schott (portrayed by Laurie Metcalf) – Winn's estranged mother and the wife of Toyman.
• Jacqueline Nimball (portrayed by Brooke Smith) – The successor of Toyman who is loosely based on Jack Nimball.
• Tanya (portrayed by Nesta Cooper) – A resident of National City who became a member of the Cult of Rao.
• Jul-Us (portrayed by Tim Russ) – A Kryptonian who survived Krypton's destruction and is a member of Argo City's High Council.
• Arthur Willis (portrayed by Bradley White) – A man who planned revenge against a firm by selling D.E.O.-based weapons.
• Thara Ak-Var (portrayed by Esmé Bianco) – A Kryptonian and an old friend of Kara that lives in Argo City.
• Val (portrayed by Benjamin Goas) – A Kryptonian that lives in Argo City.
• Felra (portrayed by Kerry Sandomirsky) – A Kryptonian that lives in Argo City and is a servant of Selena.
• Lir-Al (portrayed by Todd Thomson) – A Kryptonian that lives in Argo City.
• Vita (portrayed by Rosemary Hoschchild) – A Kryptonian dark priestess who is a member of Selena's Worldkiller Coven.

William Katt cameos as a minister that preceded over Barry Allen and Iris West's wedding until he was incinerated by Overgirl when Dark Arrow's forces attacked.

Introduced in season four

• Fiona Byrne (portrayed by Tiya Sircar) - An Empath from the planet Ikthanol who falls in love with Manchester Black. She works as a bartender and alien activist before being captured by the Children of Liberty and stabbed by Agent Liberty. After she is found in a dying state in Mercy's van, Martian Manhunter tries to heal Fiona who has her final moments with Manchester. Her death motivates Manchester to plan revenge on those responsible.
• Dr. Rohan Vose (portrayed by Vincent Gale - A well-regarded member of Fiona's alien support group who is attacked and tortured by the Children of Liberty.
• Peter Lockwood (portrayed by Xander Berkeley) - The alien-hating father of Ben Lockwood, a traditionalist who refuses to consider adapting to a changing world and blames alien refugees for his troubles. He is revealed to have perished during the events of the third-season finale, where he chooses to stay in his collapsing steel factory rather than accept things as they were. Peter's attitudes and actions would drive his son to radicalization, despite Ben having been initially more fair-minded.
• Dean Petrocelli (portrayed by Kirby Morrow) - A National City police officer and member of the Children of Liberty. He is killed by Manchester Black.
• Monitor (portrayed by LaMonica Garrett) - A Multiversal being who hands the Book of Destiny to John Deegan. He also releases J'onn J'onzz's brother on Earth-38, before retrieving the corpse of Lex Luthor.
• John Deegan (portrayed by Jeremy Davies) - A psychiatrist from Earth-1 Arkham Asylum who is given the Book of Destiny by the Monitor. His second use of the Book of Destiny gives him the appearance of Superman wearing a version of his black suit. After a talk with the Monitor, Green Arrow fires an arrow which negates the Book of Destiny's effects and leaves Deegan disfigured. Deegan is remanded to Arkham Asylum where he becomes a neighbor of Psycho-Pirate.
• Lois Lane (portrayed by Elizabeth Tulloch) - A reporter at the Daily Planet on Earth-38 and the love interest of Superman.
• Kate Kane / Batwoman (portrayed by Ruby Rose) - The cousin of Bruce Wayne on Earth-1 who runs Wayne Enterprises and fights crime after Bruce Wayne left Gotham City.
• John Diggle (portrayed by David Ramsey) - An A.R.G.U.S. agent and close friend of Oliver Queen and Felicity Smoak from Earth-1.
• Roger Hayden / Psycho-Pirate (portrayed by Bob Frazer) - An inmate at Arkham Asylum. When John Deegan is incarcerated, Psycho-Pirate is in the cell that is next door to his as he tells Deegan "worlds will live, worlds will die, and the universe will never be the same."
• Nora Fries (portrayed by Cassandra Jean Amell) - An inmate at Arkham Asylum.
• A.M.A.Z.O. - An android created by Ivo Laboratories on behalf of A.R.G.U.S. that can copy the powers of every metahuman and other beings with superhuman abilities it scans. It takes the combination of Superman, Supergirl, and Oliver Queen as Flash to enable Barry Allen as Green Arrow to hit it with a computer virus-loaded arrow. Another A.M.A.Z.O. returns as part of a new reality created by John Deegan. This one is defeated by Brainiac 5.
• General Alfonso Tan (portrayed by Russell Wong) - A colleague of Lauren Haley's, he assisted her in the indoctrination of a pair of aliens called Morae into becoming weapons for the US government. When the decision is made to terminate them, the Morae kill him.
• Maeve Nal (portrayed by Hannah James) - Nia Nal's older sister. The two were close growing up, with Maeve being Nia's staunchest supporter in embracing her gender identity, but their relationship is strained when it comes out that Nia inherited the Naltorian powers of their mother's lineage. Maeve, certain for years that she would inherit them, lashes out at her sister, even saying Nia is "not even a real woman" - words she immediately regrets, but doesn't take back.
• Isabel Nal (portrayed by Kate Burton) - The mother of Maeve and Nia and wife of Paul, Isabel is a Naltorian who emigrated to Earth years ago where she started her family. Having inherited her Dreamer abilities from her own mother, when her younger daughter Nia unexpected inherits them instead of Maeve, Isabel encourages her to accept her destiny before she succumbs to a deadly spider bite not long after
• Jerry (portrayed by Brennan Mejia) - The drug-dealing partner of Kevin, whose product is altered by happenstance and is stolen by the Children of Liberty.
• Kevin Huggins (portrayed by Lukas Gage) - The drug-dealing partner of Jerry, whose product is altered by happenstance and is stolen by the Children of Liberty.
• Paul Nal (portrayed by Garwin Sanford) - The human father of Nia and Maeve, he took the Nal surname when he married their mother Isabel. A kind and gentle man, he loves his wife dearly and trusts her instinctively. Devastated by her sudden death, he nonetheless follows instructions she gives him in a dream to give discreetly give Nia her superhero costume without tipping off Maeve.
• Pam Ferrer / Menagerie (portrayed by Jessica Meraz) - A jewel thief who got bonded to a snakelike alien symbiote, transforming her into the superpowered villain Menagerie. After she killed her partner Chuck and some other people, Menagerie was confronted by Supergirl, Martian Manhunter, Brainiac 5, and Alex Danvers. Their fight attracted the attention of the Children of Liberty. When Menagerie planned to rob the masquerade ball, she encountered Nia Nal as Supergirl and George Lockwood show up. While she did managed to subdue Supergirl, the snake-like alien on Menagerie was beheaded by George Lockwood. President Baker made an example out of Menagerie and had her incarcerated. While in her cell, Menagerie received a pleasing letter from Manchester Black. She later escapes with him and helps to form the Elite.
• Hat (portrayed by Louis Ozawa Changchien) - An alien whose hat has 5th Dimension properties. He joins up with the Elite to help Manchester Black deal with the anti-alien bigotry of the Children of Liberty and the ineffectiveness of the government and D.E.O.
• Bitsie Teschmacher (portrayed by Jill Morrison) - The cousin of Eve Teschmacher who is the mother of two girls. She came down with cancer and resides in a hospice.

Introduced in season five

• Mallory (portrayed by Ellexis Wejr) - A girl who Malefic poses as when he gathers components to make a Phantom Zone projector to release Midnight.
• Hope (voiced by Kari Wahlgren) - An A.I. that was created by Lena Luthor. After having mapped out Eve Teschmacher's brain, Lena uploads Hope into Eve's body.
• Midnight (portrayed by Jennifer Cheon Garcia) - The physical manifestation of darkness and a murderous villain released from the Phantom Zone. She was freed by Malefic to enact revenge against J'onn J'onzz who put her there.
• Pete Andrews (portrayed by Sean Astin) - A man who Malefac poses as to get close to Kelly.
• Caroline O'Connor (portrayed by Brea St. James) - A special forces commander who gets possessed by the spider-like Aurafacian symbiotes that grant her spider-like abilities. After the parasites are sucked off her by Alex, Caroline is killed by a blurry assailant.

Kate Micucci cameos as a museum tour guide in "Event Horizon."

See also

• List of DC Comics characters
• List of Arrow characters
• List of The Flash characters
• List of Legends of Tomorrow characters
• List of Arrowverse actors

External links

• Full cast and crew of Supergirl at IMDb