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Watch Supergirl Season 4 Episode 21 Online

  • 7.3/10
  • COUNTRIES: United States of America
  • Subtitles: English

Kara comes face to face with Red Daughter and the two engage in an epic battle. Determined to find a way to extract the Harun-El, Lena turns to an unlikely source for help - Lillian Luthor. Meanwhile, Alex realizes she's missing parts of her memory, and Brainy, Nia and J'onn set out to track down aliens who have been abducted by Lex.