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 Scott Button as Barista James Yi as Lead Scientist Uncredited Simon Burnett as Grodd