|The Last Daughter of Krypton|
|Season 5, Episode 18 (100)|
|The House of El||Seeing Double|
THE TRUE HEIR- Kara Danvers battles Reign and Darkseid for the future of Earth and the souls of humanity. Lena Luthor visits Clark Kent and James Olsen in Metropolis. Alex Danvers helps Karen Starr recuperate.
- Melissa Benoist as Kara Danvers/Supergirl
- Chyler Leigh as Alex Danvers
- Katie McGrath as Lena Luthor
- Odette Annable as Reign/Darkseid & Samantha Arias
- Laura Benanti as Astra In-Ze & Alura Zor-El (in Rao's Light)
- Tyler Hoechlin as Clark Kent/Superman & Jor-El
- Olivia Wilde as Susannah Russo
- Jenna Dewan as Lucy Lane
- Dianna Agron as Major Raya Zod-El
- Brenda Strong as Lillian Luthor
- Wallis Day as Junior Magistrate Nyssa-Vex
- with Claire Holt as Karen Starr/Power Girl
- and Mehcad Brooks as James Olsen
Special Appearance ByEdit
- Calista Flockhart as Cat Grant
Special Guest StarsEdit
- Helen Slater as Eliza Danvers
- Jeremy Jordan as Winn Schott (video)
- David Harewood as J'onn J'onzz
- Elizabeth Tulloch as Lois Lane
- with Zachary Quinto as Dru-Zod (in Rao's Light)
- and Jason Momoa as Lobo
- Marie Averopoulos as Diana, Princess of Themyscira/Wonder Woman
- Tamzin Merchant as Lyra Strayd
- Daniel Sharman as Lor-Zod
- Robert Gant as Zor-El (in Rao's Light)
- Briana Venskus as Agent Susan Vasquez
- with Sam Witwer as Ben Lockwood
- and Alexandra Daddario as Cameron Chase
- Antagonists: Reign, Darkseid
- Title Meaning: By this episode, both Kara and Reign have been referred to by the titular epithet. The two characters also fight to establish who is the true holder of the title
- This episode was the second candidate for the series finale.
- Kara, Alex, James, Winn, J'onn, Cat, Alura, Astra, Eliza, Zor-El, Jor-El, and Vasquez are the only characters to appear in the first and last episodes of the series.
- 9th episode this season to feature all main characters.
- This is the series finale.
- Kara, Alex, Lena, and Reign are the only characters to appear in every episode this season.
- This episode takes place on December 25, 2020, Christmas Day.
- Kara is the only character to appear in all of the first 100 episodes.
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