Dr. Caitlin Snow is Killer Frost? In the season finale of The Flash we got a quick glimpse of the new villain, Killer Frost, that my be appearing in season two. There has been a lot of speculation around Dr. Caitlin Snow being Killer Frost. Although we are not complete sure that this is true it seems that it will be most likely.
Danielle Panabaker, the actress that plays Dr. Caitlin Snow, posted this on her Instagram and twitter saying, #tbt to the time I was Killer Frost. Although she could just be saying this to trick everybody it seems highly unlikely.
Furthermore, Andrew Kreisberg, who is the Executive Producer of The Flash, tweeted this just after the season finale episode. It sounds like Dr. Caitlin Snow (Danielle Panabaker) will be playing Killer Frost in season two.