Killer Frost
The Flash Season 3



Critic Ratings: 10
Critics Consensus

Caitlin Snow takes a conflicted detour down the path of villainy in a moving installment that is given an extra kick of comic book pep by guest director Kevin Smith.

Episode Info

Caitlin uses her powers to save Barry but, as her mother predicted, the effort unleashes her inner Killer Frost. Killer Frost then 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.


Grant Gustin
as Barry Allen/The Flash
Candice Patton
as Iris West
Danielle Panabaker
as Caitlin Snow/Killer Frost
Carlos Valdes
as Cisco Ramon/Vibe
Jesse L. Martin
as Det. Joe West
Tom Cavanagh
as Harrison Wells
Show More Cast

Killer Frost Photos

Critic Reviews for Killer Frost

The action is amazing, thanks to the emotional weight that's behind each sequence. Kevin Smith is obviously a director suited for the series.

Aug 1, 2018 | Rating: 4/5 | Full Review…

Overall, this was a strong episode, and the cast definitely nailed the most important and emotional beats.

Jul 26, 2018 | Rating: B | Full Review…

Team Flash is getting crowded, but as long as the emotional truth of the character relationships is as sound as it was this week, it should be in good shape.

Jul 25, 2018 | Rating: A- | Full Review…

I liked the straightforwardness of Julian's little speech to Barry when he demands Barry's resignation in exchange for protecting Caitlin; from where he's standing, Barry looks like an irresponsible mess.

Aug 24, 2018 | Full Review…

Cant lie, the call back to the dependent on each other line was kind of adorable.

Aug 2, 2018 | Full Review…

The other standout scene was the final confrontation between Barry and Caitlin, with Barry daring her to kill him. It was an intensely dramatic moment that really put Caitlin's fragile moral compass to the test.

Aug 2, 2018 | Rating: 8.0/10 | Full Review…

Caitlin's descent into villainy didn't last of course, but it was certainly fun to watch.

Aug 1, 2018 | Full Review…

Guest director Kevin Smith does an excellent job of finally giving Caitlin a meaty story to dig into.

Jul 31, 2018 | Full Review…


Jul 30, 2018 | Rating: 5/5 | Full Review…

Man, I love HR. I love how much everyone else doesn't love him.

Jul 25, 2018 | Full Review…