Killer Frost goes on a rampage looking for Dr. Alchemy, kidnapping Julian (Tom Felton) and battling both The Flash and Vibe (Carlos Valdes).
The CW has released the promo for The Flash Episode 3.07, in which Earth-1 Caitlin finally becomes Killer Frost.
It is described as follows: “Caitlin uses her powers to save Barry (Grant Gustin) but as her mother predicted, the effort unleashes her inner Killer Frost.
Grant Gustin Barry Allen/The Flash, Candice Patton as Iris West, Danielle Panabaker as Caitlin Snow, Carlos Valdes as Cisco Ramo, Tom Cavanagh as Dr. Harrison Wells and Jesse L. Martin as Detective Joe West.