Frost formerly known as Killer Frost was Caitlin Snow's alternate personality until she obtained a body of her own. Since she was a child Killer Frost existed within Caitlin due to cryogenic experiments performed on her. She was suppressed until Caitlin's time with Team Flash when she began to emerge. Eventually Frost became a full-blown split personality the actions of whom Caitlin would not remember. #KillerFrost #CaitlinSnow #DaniellePanabaker #TheFlash #Arrowverse #DC