Supergirl was renewed for a fourth season by The CW on April 2, 2018. It premiered on October 14, 2018.


Main cast

Recurring cast

Confirmed plot points

  • The theme of the season is, "What Is Stronger; Hope or Fear?"[6]
  • The Red Son-ish cliffhanger from the Season 3 finale will become a big centerpiece in the latter part of the season.[6]
  • Ben Lockwood/Agent Liberty will be the main antagonist of this season.[7]
  • This season, Brainiac 5 will socially butt heads with a couple people.[6]
  • David Harewood will direct an episode this season.[8]
  • Lex Luthor will be introduced this season.[9]
  • James Olsen's sister will appear this season.[3]
  • Nia Nal's mother and sister will appear this season.[4]
  • Manchester Black will form a group called "Elite", consisting of Menagerie, the Hat and Coldcast.[5]

Confirmed new characters

  • Lex Luthor: He will shake things up in National City and go toe to toe with not only Supergirl, but his sister Lena Luthor.[9]
  • Kelly Olsen: Kelly is an intelligent and insightful woman who spent time in the military in order to pay for medical school. She's recently discharged from the military and is currently finishing her training as a psychiatrist. She's got a large heart and cares deeply about others.[3]
  • Maeve Nal: Driven and focused on maintaining the Nal family’s rich legacy. She and Nia have a strong sisterly bond, although Maeve has always had to work harder to achieve what comes naturally to Nia.[4]
  • Isabel Nal: The warm and nurturing mother of Nia Nal, is a local hero in her own right. She is a wise and generous matriarch and has raised her family to be bold and courageous, as well as to love fiercely and openly.[4]
  • Pamela Ferrer/Menagerie: A member of Manchester Black’s “Elite,” Menagerie is a jewel thief who doesn’t mind hurting people.[5]
  • Quentin: A wide-eyed government attaché who is grateful when Supergirl saves his life. However, when he shows his true colors by attending an anti-alien rally, Supergirl aims to prove to Quentin that not all aliens are bad.[10]
  • The Hat: A young Japanese man who gains the ability to be invulnerable and breathe fire after being merged with a demon, with his hat serving as his primary conduit.[11]


# Episode name Directed by Story by Teleplay by Original airdate
1 "The American Alien" Jesse Warn Robert Rovner & Jessica Queller Gabriel Llanas & Aadrita Mukerji October 14, 2018
Diving back into reporting, Kara welcomes a new cub reporter to CatCo. Meanwhile, James and Lena argue about James' impending indictment for acting as the vigilante Guardian, while Alex and Brainy struggle to get in sync at the DEO. Supergirl is called into action when remnants of the anti-alien terrorist organization Cadmus try to assassinate pro-alien leaders, but their endgame turns out to be much more sinister than she expected. J'onn relishes his peaceful new life, but an outing with an old friend causes him concern.
2 "Fallout" Harry Jierjian Dana Horgan Maria Maggenti & Daniel Beaty October 21, 2018
A shocking revelation causes chaos in National City. Supergirl sets out to capture Mercy Graves, while Alex takes control at the DEO. Back at CatCo, Kara decides to write an investigative story on Mercy and asks Lena if she can interview her as Mercy has ties to the Luthors. Meanwhile, Brainy meets Nia and the two end up in a precarious situation.
3 "Man of Steel" Jesse Warn Robin Wright & Derek Simon October 28, 2018
Ben Lockwood didn't always hate aliens. Through a series of incidents, and input from his anti-alien father, Ben slowly transforms from a mild-mannered professor into the villainous Agent Liberty of today.
4 "Ahimsa" Armen Kevorkian Eric Carrasco Katie Rose Rogers & Jess Kardos November 4, 2018
When Supergirl needs help, Alex asks Lena and Brainiac to team up; J'onn questions his decision to quit the DEO, but after running into Manchester Black, he realizes there are a lot of ways to help his fellow aliens.
5 "Parasite Lost" David McWhirter Maria Maggenti & Aadrita Mukerji November 11, 2018
Colonel Haley makes a surprising decision regarding Supergirl. Kara writes a series of articles highlighting aliens in National City in the hopes that humans will stop being so fearful of them. Unfortunately, the article puts some of the aliens in harm’s way.
6 "Call to Action" Antonio Negret Gabriel Llanas & Daniel Beaty November 18, 2018
Everyone gathers for Thanksgiving but Kara is feeling down after her televised debate with Ben Lockwood about the anti-alien sentiment coursing through National City. Meanwhile, James and Lena argue about the best way to handle the Children of Liberty.
7 "Rather the Fallen Angel" Chad Lowe Dana Horgan & Katie Rose Rogers November 25, 2018
James falls in deeper with the Children of Liberty in his efforts to meet Agent Liberty. Meanwhile, Supergirl and Manchester Black follow a lead on Agent Liberty’s location, but things take a dark turn. Lena kicks off her first set of trials.
8 "Bunker Hill" Kevin Smith Rob Wright & Eric Carrasco December 2, 2018
Nia has a powerful dream about Agent Liberty but refuses to look at it as a prophetic dream and pushes it aside. After noticing something is bothering Nia, Kara enlists Brainy's help, and the two try to persuade Nia to embrace her destiny. Meanwhile, Manchester Black pays Ben Lockwood a menacing visit.
9 "Elseworlds, Part 3" Jesse Warn Marc Guggenheim Derek Simon & Robert Rovner December 11, 2018
Supergirl, The Flash, Green Arrow and Superman engage in the battle of their lives.
10 "Suspicious Minds"[12] Rachel Talalay Maria Maggenti & Gabriel Llanas January 20, 2019[13]
Colonel Haley is upset after Supergirl responds to a distress call from a Navy ship that turned out to be a deadly alien attack. Colonel Haley reclaims the site as DEO territory and demands that Supergirl step aside. After Supergirl refuses to be told what to do, Haley refocuses her energy on finding out Supergirl’s true identity and begins to interrogate all DEO agents, including Alex. Meanwhile, Brainiac-5 tries to persuade Nia to embrace her superpowers but she misinterprets his motives.[14]
11 TBA TBA TBA January 27, 2019[15]
13 "What's So Funny About Truth, Justice And The American Way?"[11] TBA TBA TBA
14 "Stand and Deliver"[10] TBA TBA TBA


Title cards

Promotional images


  • This season airs on Sundays at 8/7c, as opposed to the past three seasons, where it aired on Mondays at the same time.
  • Manchester Black was originally going to be the main antagonist of this season.[16]


  1. "Supergirl: Jeremy Jordan Shifts to Recurring Status in Season 4" - TVLine
  2. "Breaking News: Jon Cryer to Play Lex Luthor on Supergirl" - DC Comics
  3. 3.0 3.1 3.2 "‘Supergirl’: Azie Tesfai To Play James Olsen’s Sister On the CW’s DC Series" - Deadline Hollywood
  4. 4.0 4.1 4.2 4.3 "‘Supergirl’: Hannah James & Kate Burton Cast As Maeve & Isabel Nal In CW Series" - Deadline
  5. 5.0 5.1 5.2 "‘Supergirl’: Jessica Meraz Cast As Iconic DC Villain On the CW Series" - Deadline
  6. 6.0 6.1 6.2 "Supergirl @ Comic-Con: 'Grounded' Season 4 Brings Back Kara the Reporter" - TVLine
  8. David Harewood (@DavidHarewood) - Twitter
  9. 9.0 9.1 "Lex Luthor Is Headed to Supergirl — Who Should Play the Iconic Big Bad?" - TVLine
  10. 10.0 10.1 "Supergirl Casts Jonathan Bennett as Anti-Alien Troublemaker" - TVLine
  11. 11.0 11.1 "'Supergirl' Casts Louis Ozawa Changchien as The Elite's "The Hat""-
  12. [1]
  13. "The CW January 2019 Midseason Schedule" - SpoilerTV
  14. [2]
  15. "Shows A-Z - supergirl on cw" - The Futon Critic