Frost had worked alongside Professor Martin Stein at a research laboratory, and developed affection for him which he did not return. Shortly thereafter, she was locked into a thermo frost unit which mutated her body into becoming the heat absorption powered Killer Frost. Seeking revenge, she found herself locked time and again in battle with Stein's alter ego of Firestorm of Earth-One. She was recruited briefly into the Secret Society of Super-Villains.
Black Lightning and Storm in: "Zapped by Zzzax!"
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