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 Jessica Parker Kennedy Nora Actor Hartley Sawyer Ralph Dibny Actor Chris Klein Cicada Actor LaMonica Garrett The Monitor Guest Star Stephen Amell Oliver Queen Guest Star Melissa Benoist Supergirl Guest Star Tyler Hoechlin Clark Kent Guest Star Bitsie Tulloch Lois Lane Guest Star Greg Berlanti Executive Producer Andrew Kreisberg Executive Producer David Nutter Executive Producer Sarah Schechter Executive Producer Kevin Tancharoen Director Eric Wallace Writer Sam Chalsen Writer