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, Director 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 Jeremy Jordan Winn Schott Guest Star Greg Berlanti Executive Producer Allison Adler Executive Producer Andrew Kreisberg Executive Producer Sarah Schechter Executive Producer Dana Horgan Writer Katie Rose Rogers Writer