Victor Garber Professor Stein, Half of Firestorm Actor Brandon Routh Ray Palmer, Atom Actor Arthur Darvill Rip Hunter Actor Dominic Purcell Mick Rory, Heat Wave Actor Nick Zano Dr. Nate Heywood, Citizen Steel Actor Caity Lotz Sara Lance, White Canary Actor Franz Drameh Jefferson "Jax" Jackson, Half of Firestorm Actor Matt Letscher Eobard Thawne, Reverse-Flash Actor Maisie Richardson-Sellers Amaya Jiwe, Vixen Actor Amy Louise Pemberton Gideon Voice Stephen Amell Oliver Queen, Green Arrow Guest Star David Ramsey John Diggle, Spartan Guest Star Emily Bett Rickards Felicity Smoak Guest Star Danielle Panabaker Caitlin Snow Guest Star Carlos Valdes Cisco Ramon, Vibe Guest Star Melissa Benoist Kara Danvers, Supergirl Guest Star Grant Gustin Barry Allen, The Flash Guest Star Christina Brucato Lily Stein Guest Star Donnelly Rhodes Agent Smith Guest Star Lucia Walters President Susan Brayden Guest Star Greg Berlanti Executive Producer Marc Guggenheim Executive Producer, Writer Andrew Kreisberg Executive Producer Phil Klemmer Executive Producer, Writer Chris Fedak Executive Producer Sarah Schechter Executive Producer Gregory Smith Director