Melissa Benoist Kara Danvers, Supergirl Actor Chyler Leigh Alex Danvers Actor Mehcad Brooks James Olsen Actor David Harewood Hank Henshaw Actor Jeremy Jordan Winslow "Winn" Schott Actor Chris Wood Mon-El Actor Floriana Lima Maggie Sawyer Actor Helen Slater Eliza Danvers Guest Star Katie McGrath Lena Luthor Guest Star Grant Gustin Barry Allen, The Flash Guest Star Carlos Valdes Cisco Ramon Guest Star Greg Berlanti Executive Producer Allison Adler Executive Producer Andrew Kreisberg Executive Producer Sarah Schechter Executive Producer Stefan Pleszczynski Director Jessica Queller Writer Derek Simon Writer