X3: As the leader of a gang known as the Omega Muties, Callisto led many mutants who were considered even greater outcasts of society. When she met Magneto and learned of his staunch opposition to the newly released mutant cure, she became intrigued by him and he welcomed her to his side, especially when he learned of her tracking ability. She used this to find Mystique for him, as well as inform him of Jean Grey’s resurrection. When he followed Jean back to her old home, he had Callisto and her gang guard against the other X-Men from interfering. During the fight that broke out, Callisto focused her attacks on Storm, brutally beating her until Jean killed Xavier.
When Magneto decided to get rid of the cure himself by killing Leech, he led his new Brotherhood to Worthington Labs on Alcatraz Island. When the X-Men arrived to stop them, Callisto again focused her attacks on Storm. She seemed to have the upper hand on the weather mutant, until Storm managed to use Callisto’s speed against her. Storm then fought back hard, throwing Callisto into a metal fence, then electrocuting her with lightning.
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