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. Each different individual in the DC Universe assuming the Killer Frost persona is usually as an adversary (or acquaintance, ally, love interest) of the superhero Firestorm.
Various iterations (Crystal Snow and Louise Lincoln) have appeared in various animated projects and video games with most of them having the character voiced by Jennifer Hale. Danielle Panabaker portrays Caitlin Snow and her split personality Killer Frost on the shared DC Arrowverse shows, where she is the main character on the television series The Flash.
That’ll cool you off!”