Killer Frost was one of many villains who were forced into One Earth's "re-education" program in the Phantom Zone.

She joined Superman's regime out of self preservation.

Injustice: Gods Among Us

Frost and Solomon Grundy are stationed in Wayne Manor, guarding the Batcave. When Batman arrives at the Manor with the displaced Justice League members he pulled from their dimension, Frost and Grundy are there to greet them. While Frost duels Wonder Woman with an ice sword, Grundy is beaten by Green Arrow and flown into space by Green Lantern. In response, Frost freezes Wonder Woman solid and fights Green Arrow when he defrosts her, only to be beaten.

Killer Frost is later moved to the Ferris Aircraft facility, where she works on locating the places where the duplicate heroes arrived by searching for anomalies in the space-time continuum. She theorizes that the duplicates were brought in by the Insurgency, bringing her theory to the Regime's Wonder Woman. The Regime Diana is initially annoyed by Frost's lack of certainty in her findings, but tells her to have the Flash confirm her theory. Upon turning around, however, Killer Frost finds the Regime Wonder Woman with her arms bound with her own lasso and Deathstroke standing over her. He congratulates Frost's "detective work", but tells her it is too late. The two clash and Deathstroke emerges victorious.

Killer Frost later participates in the attack on Gotham City and on the Insurgency's headquarters. She succeeds in freezing Cyborg's arm, then attacks him alongside Solomon Grundy. Both Frost and Grundy fails.

After the Regime Superman's defeat, Frost is shown being apprehended and loaded into a prison-vehicle, along with the rest of Superman's accomplices.

Possible Post-Regime Epilogue

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This section of history takes place in a timeline outside that of normal Injustice canon.

Upon beating "Classic" mode in Injustice: Gods Among Us or "Multiverse" mode in Injustice 2 with any playable fighter, the player would receive a possible alternate ending to the game's story featuring their fighter. These alternate histories should not be seen as relevant to future sequels or comic adaptations.

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Killer Frost reveled in her victory--but her overconfidence betrayed her. Seizing the opportunity, agents of S.T.A.R. Labs captured her. Their scientists harnessed her freezing power in order to fortify the world's polar ice caps.

But S.T.A.R. Labs underestimated Frost's abilities. Turning on her captors, she froze their facility--and eventually the entire Western Hemisphere. The survivors now struggle to overthrow the self-proclaimed Ice Queen.

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Footnotes


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Suicide Squad member
This character is or was a member of the Suicide Squad, a team of imprisoned super-villains who perform high-risk missions for the U.S. Government in exchange for commuted sentences, in any of its various incarnations. This template will categorize articles that include it into the "Suicide Squad members" category.

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Justice League Villain
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This character is or was primarily an enemy of the Justice League, in any of its various incarnations. This template will categorize articles that include it into the category "Justice League Villains."

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