Killer Frost is a name used by several 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 usually has some connection to the superhero Firestorm. Various iterations of Killer Frost, primarily Crystal Frost and Louise Lincoln, have appeared in various animated projects and video games, with a majority of them voiced by Jennifer Hale. Additionally, Danielle Panabaker portrayed Caitlin Snow and her Killer Frost persona eventually renamed Frost in The CW's Arrowverse franchise, such as the television series The Flash. Fictional character biographies Crystal Frost Crystal Frost was the first incarnation, first appearing in Firestorm #3 (June 1978). While Frost was studying to be a scientist in Hudson University, she fell in love with her teacher Martin Stein. While working on a project in the Arctic, Frost was upset to learn that Stein did not reciprocate her feelings; Stein told a fellow researcher that Frost was a withdrawn student and that Stein had merely tried to draw her out of her shell, which Crystal completely misinterpreted. Frost accidentally locked herself in a thermafrost chamber but survived, being transformed in a way in which she was able to absorb heat from a living being and project cold and ice. Calling herself "Killer Frost", she began her murderous crusade against men and clashed with Firestorm on many occasions. Killer Frost eventually died after she absorbed too much energy from Firestorm. She has been identified as one of the deceased villains entombed below the Hall of Justice. Her body was reanimated as a Black Lantern. Louise Lincoln Dr. Louise Lincoln is the second incarnation; she first appeared in Firestorm (vol. 2) #21 (March 1984) and used the "Killer Frost" name in Firestorm (vol. 2) #34 (April 1985). Lincoln was a colleague and friend to Crystal Frost. After her friend's death, Lincoln decided to repeat the experiment as a last respect to her friend, with Lincoln herself as the second Killer Frost. Just as ruthless as her predecessor, she began her own personal vendetta against Firestorm whom she blamed for her friend's death. She briefly served as a member of the Suicide Squad and sold her soul to Neron for more power. During the Underworld Unleashed event, Killer Frost attacked Hawaii, freezing part of the islands before being stopped by Superboy and