Supergirl Season 3 Episode 17
SUPERGIRL TAKES ON ALL THREE WORLDKILLERS – Still reeling after learning about Lena’s (Katie McGrath) secret, Supergirl (Melissa Benoist) asks Guardian (Mehcad Brooks) for a favor that could alter his relationship with Lena forever. Meanwhile, with all three Worldkillers united, Supergirl and the team brace for an epic battle.
Directed by: Caitlin Parrish & Erica Weiss
Story by Jessica Queller
Teleplay by Caitlin Parrish & Derek Simon (#317).