Victor Garber Professor Stein, Half of Firestorm Actor Brandon Routh Ray Palmer, Atom Actor Dominic Purcell Mick Rory, Heat Wave Actor Nick Zano Dr. Nate Heywood, Citizen Steel Actor Caity Lotz Sara Lance, White Canary Actor Maisie Richardson-Sellers Amaya Jiwe, Vixen Actor Amy Louise Pemberton Gideon Voice Tala Ashe Zari Adrianna Tomaz Actor Neal McDonough Damien Darhk Actor Keiynan Lonsdale Wally West, Kid Flash Actor Wentworth Miller Leo Snart, Citizen Cold Guest Star Matt Ryan John Constantine Guest Star John Noble Mallus Guest Voice Jes Macallan Ava Sharpe Guest Star Tracy Ifeachor Kuasa Guest Star Madeleine Arthur Emily Guest Star Annabel Marshall-Roth Young Dr. Moore Guest Star Greg Berlanti Executive Producer Marc Guggenheim Executive Producer Andrew Kreisberg Executive Producer Phil Klemmer Executive Producer Chris Fedak Executive Producer Sarah Schechter Executive Producer Dermott Downs Director Keto Shimizu Writer Matthew Maala Writer