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Supergirl – Season 4, Episode 21: Full Cast & Crew Aired May 12, 2019 Drama/Fantasy/Action
Kara comes face to face with Red Daughter and the two engage in an epic battle; Lena turns to an unlikely source for help; Alex realizes she's missing parts of her memory; Brainy, Nia and J'onn set out to track down aliens who have been abducted. TV-PG Air Date: May 12, 2019 See TV Episode Details

Cast & Crew

All Cast Crew
Melissa Benoist Kara Danvers, Supergirl Actor Chyler Leigh Alex Danvers Actor Mehcad Brooks James Olsen Actor David Harewood Hank Henshaw Actor Katie McGrath Lena Luthor Actor Jesse Rath Querl "Brainy" Dox, Brainiac 5 Actor Nicole Maines Nia Nal, Dreamer Actor April Parker Jones Colonel Lauren Haley Actor Sam Witwer Agent Liberty Actor Brenda Strong Lillian Luthor Guest Star Greg Berlanti Executive Producer Allison Adler Executive Producer Andrew Kreisberg Executive Producer Sarah Schechter Executive Producer Lindsay Sturman Writer Gabriel Llanas Writer Eric Carrasco Writer Alexis Ostrander Director