Supergirl realizes that in order to stop Lex and Leviathan she must work with the one person she never thought she’d trust again—Lena. Nia keeps dreaming about Brainy but struggles with what the dreams are trying to tell her. Brainy realizes there is only one way to stop Lex.
Elenco: Melissa Benoist , Chyler Leigh , David Harewood , Mehcad Brooks , Jeremy Jordan , Katie McGrath , Chris Wood , Jesse Rath , Nicole Maines , Odette Annable , Floriana Lima , Calista Flockhart , Andrea Brooks , Azie Tesfai , Julie Gonzalo , Staz Nair .