In the last two episodes of Flash Season 1 we see all of the characters Flash has
imprisoned beneath STAR Labs
use their metahuman abilities
when Captain Cold helps them escape captivity
Of course, 4 of these characters are familiar to anyone who has watched the show to that point:
They were each the focus of at least one episode, and we are aware of their powers. With them was a fourth man, who hadn't been the subject of an episode. Flash was obviously aware of who he was and what his powers were, but it came as a big surprise to me when he shot lasers from his eyes.
Who is this character, and how did he end up in that situation? When was he first introduced?