Caitlin uses her powers to save Barry but as her mother predicted, the effort unleashes her inner Killer Frost. Killer Frost goes on a rampage looking for Dr. Alchemy, kidnapping Julian and battling both The Flash and Vibe. Meanwhile, Joe and H.R. have a heart to heart talk.
Elenco: Grant Gustin , Candice Patton , Danielle Panabaker , Jesse L. Martin , Carlos Valdes , Tom Cavanagh , Danielle Nicolet , Kayla Compton , Brandon McKnight , Hartley Sawyer , Rick Cosnett , Tom Felton , Keiynan Lonsdale , Jessica Parker Kennedy , Jon Cor .