The Flash is quickly heading our way, and adding new DC Comics characters to its cast list left and right. Just last week, Prison Break star Wentworth Miller signed on to play one of the Flash's biggest villains, Captain Cold, and just before that The Tomorrow People alum Robbie Amell (cousin to Arrow star Stephen Amell) boarded the show as the superhero Firestorm. They join already-announced characters like Killer Frost and Vibe, Professor Zoom, and Weather Wizard.