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 Katie McGrath Lena Luthor Actor Odette Annable Samantha Arias Actor Grant Gustin Barry Allen, The Flash Guest Star Candice Patton Iris West Guest Star Wentworth Miller Citizen Cold Guest Star Russell Tovey The Ray Guest Star Emily Bett Rickards Felicity Smoak Guest Star Stephen Amell Oliver Queen, Green Arrow Guest Star Caity Lotz Sara Lance, White Canary Guest Star Victor Garber Dr. Martin Stein Guest Star Jesse L. Martin Joe West Guest Star Tom Cavanagh Wells Guest Star Dominic Purcell Mick Rory Guest Star Franz Drameh Jefferson Jackson, Firestorm Guest Star Danielle Panabaker Caitlin Snow, Killer Frost Guest Star Carlos Valdes Cisco Ramon, Vibe Guest Star Keiynan Lonsdale Wally West, Kid Flash Guest Star Greg Berlanti Executive Producer Allison Adler Executive Producer Andrew Kreisberg Executive Producer, Writer Sarah Schechter Executive Producer Larry Teng Director Marc Guggenheim Writer Robert Rovner Writer Jessica Queller Writer