Grant Gustin Barry Allen, The Flash Actor Candice Patton Iris West Actor Danielle Panabaker Caitlin Snow Actor Carlos Valdes Cisco Ramon, Vibe Actor Tom Cavanagh Dr. Harrison Wells Actor Jesse L. Martin Detective Joe West Actor Keiynan Lonsdale Wally West, Kid Flash Actor Wentworth Miller Citizen Cold Guest Star Russell Tovey The Ray Guest Star Emily Bett Rickards Felicity Smoak Guest Star Chyler Leigh Alex Danvers Guest Star Stephen Amell Green Arrow Guest Star Melissa Benoist Supergirl Guest Star Caity Lotz White Canary Guest Star Greg Berlanti Executive Producer Andrew Kreisberg Executive Producer, Writer David Nutter Executive Producer Sarah Schechter Executive Producer Dermott Downs Director Marc Guggenheim Writer Todd Helbing Writer