Killer Frost

Killer Frost is a name used by several fictional female supervillains and superheroes appearing in comic books published by DC Comics: Crystal Frost, Louise Lincoln and Caitlin Snow. She is a known villain towards the superhero Firestorm.
In television shows and video games, she is voiced by Jennifer Hale. Danielle Panabaker plays the character on the shared DC "Arrowverse" shows, where she is a main character on the television series "The Flash".