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 Stephen Amell Oliver Queen, Green Arrow Guest Star John Barrowman Malcolm Merlyn Guest Star Emily Bett Rickards Felicity Smoak Guest Star Willa Holland Thea Queen, Speedy Guest Star David Ramsey John Diggle, Spartan Guest Star Ciara Renée Kendra Saunders, Hawkgirl Guest Star Neal McDonough Damien Darhk Guest Star Teddy Sears Jay Garrick Guest Star Casper Crump Vandal Savage Guest Star Falk Hentschel Carter Hall, Hawkman, Prince Khufu Guest Star Shantel VanSanten Patty Spivot Guest Star Greg Berlanti Executive Producer, Writer Andrew Kreisberg Executive Producer, Writer David Nutter Executive Producer Sarah Schechter Executive Producer Ralph Hemecker Director Aaron Helbing Writer Todd Helbing Writer