Killer Frost

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.

Greg Grunberg

Tom Patterson

Lisa MacFadden

Anne

Blair Penner

Craig

Taylor St. Pierre

Acolyte

Tobin Bell

Doctor Alchemy / Savitar (voice) (uncredited)

Andre Tricoteux

Savitar