Melissa Benoist Kara Danvers, Supergirl Actor Chyler Leigh Alex Danvers Actor Mehcad Brooks James Olsen Actor David Harewood Hank Henshaw, J'onn J'onzz Actor Katie McGrath Lena Luthor Actor Nicole Maines Nia Nal, Dreamer Actor Jesse Rath Querl "Brainy" Dox, Brainiac 5 Actor April Parker Jones Colonel Lauren Haley Actor Sam Witwer Agent Liberty Actor Julie Gonzalo Andrea Rojas Actor Meaghan Rath Guest Star Greg Berlanti Executive Producer Allison Adler Executive Producer Andrew Kreisberg Executive Producer Sarah Schechter Executive Producer Tawnia McKiernan Director Derek Simon Writer Nicki Holcomb Writer Jen Troy Writer