Melissa Benoist Kara Danvers, Supergirl Actor Calista Flockhart Cat Grant Actor Chyler Leigh Alex Danvers Actor Mehcad Brooks James Olsen Actor David Harewood Hank Henshaw Actor Jeremy Jordan Winslow "Winn" Schott Actor Laura Benanti Alura Zor-El , Astra Guest Star Malina Pauli Weissman Young Kara Zor-El Guest Star Peter Facinelli Maxwell Lord Guest Star Justice Leak Hellgrammite Guest Star Rich Ceraulo Agent Hartmann Guest Star Preston James Hillier Fire Chief Guest Star Justin Chu Cary Guard 1 Guest Star Frank Pacheco Guard 2 Guest Star Ron Bottitta Doctor Guest Star Jay Jackson Male Newscaster Guest Star Mike Owen Thug Guest Star Avelena Wijesundera Girl Guest Star Rey Valentin Ricardo Guest Star Eric Steinberg Commander Gor Guest Star Greg Berlanti Executive Producer, Writer Allison Adler Executive Producer, Writer Andrew Kreisberg Executive Producer, Writer Sarah Schechter Executive Producer Glen Winter Director