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- Season 4 overviewOct 14, 2018-May 19, 201922 episodesSeason 4 episodes1. American Alien Oct 14, 2018
- Kara welcomes a new cub reporter to CatCo; James and Lena argue about James' impending indictment.
- 2. Fallout Oct 21, 2018
- A shocking revelation causes chaos in National City; Supergirl sets out to capture Mercy Graves.
- 3. Man of Steel Oct 28, 2018
- Ben Lockwood slowly transforms from a mild-mannered professor into the villainous Agent Liberty.
- 4. Ahimsa Nov 4, 2018
- When Supergirl needs help, Alex asks Lena and Brainiac to team up; J'onn questions his decision.
- 5. Parasite Lost Nov 11, 2018
- Haley makes a surprising decision regarding Supergirl; Kara writes articles about the city's aliens.
- 6. Call to Action Nov 18, 2018
- As everyone gathers for Thanksgiving, Kara is feeling down after her debate with Ben Lockwood.
- 7. Rather the Fallen Angel Nov 25, 2018
- James falls in deeper with the Children of Liberty in his efforts to meet Agent Liberty.
- 8. Bunker Hill Dec 2, 2018
- Kara and Brainy try to persuade Nia to embrace her destiny; Manchester Black pays Ben a visit.
- 9. Elseworlds, Part 3 Dec 11, 2018
- Supergirl, The Flash, Green Arrow and Superman engage in the battle of their lives.
- 10. Suspicious Minds Jan 20, 2019
- Haley wants to uncover Supergirl's true identity; Brainiac-5 encourages Nia to embrace her powers.
- 11. Blood Memory Jan 27, 2019
- Alex deals with a street drug that is turning people violent and giving them temporary superpowers.
- 12. Menagerie Feb 17, 2019
- Kara teams up with J'onn on an assignment, which ends up tying directly into Alex's investigation.
- Supergirl tries to apprehend Manchester Black after his new team helps him break out of prison.
- 14. Stand and Deliver Mar 10, 2019
- When Lockwood organizes a rally, Supergirl and Dreamer patrol to keep everyone safe.
- 15. O Brother, Where Art Thou? Mar 17, 2019
- Furloughed from prison due to failing health, Lex Luthor visits his sister to seek her help.
- 16. The House of L Mar 24, 2019
- In the wake of Lex Luthor's return, flashbacks show what he's been doing for the last two years.
- 17. All About Eve Mar 31, 2019
- Supergirl must deal with the destructive aftermath of Lex's nefarious plans.
- 18. Crime and Punishment Apr 21, 2019
- Kara and Lena head to Stryker's Island to search for clues on how to defeat Lex.
- 19. American Dreamer Apr 28, 2019
- Kara doggedly works as a reporter to clear Supergirl's name; James takes drastic measures.
- Eve Tessmacher sets a trap that could ultimately reveal that Kara is Supergirl.
- 21. Red Dawn May 12, 2019
- Kara comes face to face with Red Daughter and the two engage in an epic battle.
- 22. The Quest for Peace May 19, 2019
- When Supergirl realizes she has one last chance to stop Lex, she turns to the press for help.