Caitlin Snow (Earth-2)

"Killer Frost", formerly known as Caitlin Snow is a meta-human from Earth Two. She is also the wife of the late Ronnie Raymond.

Biography
Caitlin Snow was affected by the S.T.A.R. Labs particle accelerator, giving her cryokinesis abilities. Since then, Caitlin cut off all ties to her past life and began calling herself "Killer Frost".

The arrival of Earth One Flash
After Reverb learned that his doppelgänger had arrived on Earth Two, Caitlin and Ronnie searched for them.

The two went to Jitterbugs and asked everyone which one of them were in the wrong universe. When Barry called her Caitlin, Killer Frost told him she no longer went by that name. Killer Frost then fired icicles toward Barry, who used a table as a shield. Killer Frost and Ronnie were brought outside while Iris was distracted. After failing to kill Barry, Killer Frost told her husband to do the job. The Flash used a helmet from a statue of Jay Garrick to redirect fire hurled by Ronnie toward Killer Frost. She was then taken away by Ronnie.

Later, Killer Frost and Ronnie were approached by Iris West, Floyd Lawton and Cisco Ramon, though she and Ronnie made the three stand their weapons down. When Reverb tried to get Vibe to join him, the Flash intervened. The Flash was eventually overpowered by both Reverb and Ronnie but Killer Frost warned them that Zoom told them to make sure the Flash was left unharmed. Zoom arrived and killed Ronnie and Reverb, much to Killer Frost's dismay. She was approached by Zoom but was told the latter was happy one of them knew their place. After Zoom sped off, Caitlin ran toward her husbands body but soon ran away.