Guest Stars Robbie Amell as Ronald "Ronnie" Raymond / Firestorm Victor Garber as Dr. Martin Stein / Firestorm Clancy Brown as General Wade Eiling Roger Howarth as Mason Bridge Isabella Hofmann as Clarissa Stein Co Starring Herbert Duncanson as Sergeant Bates James Yi as Lead Scientist Scott Button as Barista Uncredited Simon Burnett as Grodd