Crystal Frost (1978-1984)
After gaining the powers of Killer Frost, Crystal’s first mission was to kill her former love, Martin Stein, whom she blamed for her transformation. But by this point Stein was one half of the Super Hero Firestorm and defeated her. After a brief membership in the Secret Society of Super-Villains, Frost consulted with her old college friend Dr. Louise Lincoln. Louise ran some tests and discovered that Crystal’s powers were killing her and that she had only hours to live. In THE FURY OF FIRESTORM #21 (1984), an enraged Killer Frost began terrorizing civilians on the George Washington Bridge and fought Firestorm. With Frost’s body aging rapidly from her disease, Firestorm realized that the only way to save her was to let her absorb the nuclear heat from his body. But when Killer Frost kissed Firestorm to absorb his energy, she was consumed by the resulting atomic explosion.
Louise Lincoln (1984-2013)
Following her christening as the second Killer Frost, Louise Lincoln blamed Firestorm for the death of her friend Crystal Frost. After several battles with Firestorm and the Justice League of America, she became a member of the Suicide Squad in THE FURY OF FIRESTORM #64 (1987), before being asked by Lex Luthor to join his new Injustice League.
Underworld Unleashed (UNDERWORLD UNLEASHED, 1995)
This 1995 miniseries revolved around a new ruler of Hell, Neron, offering several Super Heroes and Super-Villains their greatest desires in exchange for their souls. Louise Lincoln was given greater cold powers by the demon. She then attacked Hawaii, freezing several of the islands before she was stopped by Superboy and Knockout.
Public Enemies (SUPERMAN/BATMAN #1-6, 2003-2004)
In the 2003 SUPERMAN/BATMAN story arc “Public Enemies,” U.S. President Lex Luthor declared Superman and Batman enemies of the state, and offered a one-billion-dollar reward to anyone who could bring them to justice. Killer Frost joined a team of cold-based villains to take down the heroes, partnering with Captain Cold, Mr. Freeze and Icicle. But it was later revealed in SUPERMAN/BATMAN #3 (2003) that “Team Ice” was mind-controlled by Gorilla Grodd.
Caitlin Snow (2013-Present)
New 52 (2012-2016)
The New 52 saw a new Killer Frost in the form of Dr. Caitlin Snow, a former scientist at S.T.A.R. Labs. After she was transformed into the ice-cold villain in the Arctic, she was plagued with a disease that forced her to purge heat from others so she could survive. After meeting Firestorm, she realized his powers could temporarily heal her mutation. So she tried to re-create the Firestorm Nuclear Matrix many times, to no avail. After tracking down Martin Stein during the events of FOREVER EVIL (2013-2014), she encountered Steve Trevor and helped him rescue the Justice League, the members of which were thought to be dead after the Crime Syndicate’s takeover of Earth. But the League was revealed to have been trapped inside the Firestorm Matrix.
In Rebirth, Killer Frost was taken to Belle Reve Penitentiary, where Amanda Waller offered her membership in the Suicide Squad, alongside Deadshot, Harley Quinn and Captain Boomerang. In JUSTICE LEAGUE VS. SUICIDE SQUAD (2016), Snow fought with the Squad against the League, before the two groups joined forces to defeat Maxwell Lord’s original Suicide Squad. Batman asked Snow to join a new Justice League team in JUSTICE LEAGUE OF AMERICA: REBIRTH #1 (2017), one that included the Atom, Lobo, Black Canary, Vixen and the Ray.