We got a small glimpse of Danielle Panabaker’s Killer Frost in the Season 1 finale of The Flash. During her appearance on The Talk, Panabaker debuted her full villainous look and expressed her excitement in creating the look.
“I’m such a girl, and I loved getting dressed up in that look. We started working on the look a couple of months before we shot. Our first suit was a one-piece, kind of like Catwoman, but it didn’t feel quite right. So we changed it to be a top and these really cool leather pants. And the hair was awesome; it started as this short, little pixie wig, and we just kept adding more and more hair. It’s great, I’m really excited.”
It’s still unclear how Danielle Panabaker’s Caitlin Snow makes the transformation to Killer Frost, but one possibility is that she is the Earth 2 version of Snow.