Supergirl Temporada 4 Episódio 21

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 shes missing parts of her memory, and Brainy, Nia and Jonn set out to track down aliens who have been abducted by Lex.