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 Tom Felton Julian Albert Actor Stephen Amell Oliver Queen, Green Arrow Guest Star Franz Drameh Jefferson Jackson, Firestorm Guest Star Victor Garber Dr. Martin Stein Guest Star Willa Holland Thea Queen, Speedy Guest Star Caity Lotz Sara Lance, White Canary Guest Star Dominic Purcell Mick Rory, Heat Wave Guest Star David Ramsey John Diggle, Spartan Guest Star Emily Bett Rickards Felicity Smoak Guest Star Greg Berlanti Executive Producer, Writer Andrew Kreisberg Executive Producer, Writer David Nutter Executive Producer Sarah Schechter Executive Producer Dermott Downs Director Aaron Helbing Writer Todd Helbing Writer