<P> 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 . </P> <Ul> <Li> Alura Zor - El (portrayed by Laura Benanti in season one and two, Erica Durance in season three)--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 . </Li> <Li> Astra In - Ze (portrayed by Laura Benanti)--The aunt of Kara and the twin sister of Alura . 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 . 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 . </Li> <Li> Eliza Danvers (portrayed by Helen Slater)--A 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 . </Li> <Li> Jeremiah Danvers (portrayed by Dean Cain)--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 2, 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 . </Li> <Li> 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 . </Li> <Li> Maxwell Lord (portrayed by Peter Facinelli)--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 . </Li> <Li> Barry Allen / Flash (portrayed by Grant Gustin)--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 2, 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 . </Li> <Li> Non (portrayed by Chris Vance)--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 . </Li> <Li> Lucy Lane (portrayed by Jenna Dewan - Tatum)--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 DEO . By the end of the first season, Lucy officially becomes a co-director with J'onn J'onzz after he returns to the DEO . </Li> <Li> Leslie Willis / Livewire (portrayed by Brit Morgan)--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 the second season, 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 . </Li> <Li> Sam Lane (portrayed by Glenn Morshower)--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 . </Li> <Li> Kal - El / Clark Kent / Superman (portrayed by Tyler Hoechlin)--A superhero from the planet Krypton who defends Metropolis . He was only shown briefly during the first season 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 the first season, 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 DEO until the last episode, where he wonders if the headache he's having is what a hangover is like . He comes to National City at the beginning of Season 2 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 2, 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 . </Li> <Li> Siobhan Smythe / Silver Banshee (portrayed by Italia Ricci)--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 . </Li> <Li> Indigo (portrayed by Laura Vandervoort)--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 . Vandervoort portrayed Supergirl in the series Smallville . </Li> </Ul> <Li> Alura Zor - El (portrayed by Laura Benanti in season one and two, Erica Durance in season three)--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 . </Li> <Li> Astra In - Ze (portrayed by Laura Benanti)--The aunt of Kara and the twin sister of Alura . 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 . 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 . </Li>

Who plays supergirl's mom on the tv series