Real Name: Unknown Callisto was somehow healed, but was captured or somehow enslaved by Masque, who morphed her arms into super-strong tentacles of various shapes and sizes. Callisto became the Champion of one of Masque's underground fighting arenas, and was forced to challenge Storm in single combat. Using throwing blades and her many tentacles, Cal defeated Storm, but together they broke Masque's hold and took control of the Arenas. While Masque removed all changes from Storm, Callisto opted to keep her tentacled arms. Callisto continued to recruit for the Arena, but was also asked by Storm to check on Professor X, who had ventured to Genosha to bury Magneto's body following Magnus's assault on New York. Cal was shocked to find Magneto alive and well (the attacker of New York had been an impostor) and decided to stay on Genosha for a while and keep tabs on excatly what Xavier was planning.
Cal soon took effective control of the "field" team of mutants who had gathered in Genosha, and when Dark Beast was brutally injured in an ambush, she (along with Karima Shapandar) investigated, only to find the hideous Sugar Man and Rastus from the "Age of Apocalypse." Though Cal was incredibly agile, Rastus caught her and bit her left tentacles in half. Cal and Karima killed both villains, and her wounds eventually healed, but her arms don't appear to have re-grown and remain at half-size. The injury didn't stop Cal from leading the mutants to help the people of Zanzibar against the Weaponeers, where she also fought with Archangel against Viper, and revealed heretofore unknown piloting skills.
Following M-Day, Callisto was depowered and returned to her fully human form. When Quicksilver arrived and offered her the Terrigen Mists as a means of regaining her abilities, Cal gladly accepted. Unfortunately, the Mists caused Callisto's senses to go haywire, overloading her with information to the point where she could feel the slighted shift in the air and hear dust settling. Her mind shut down to prevent permanent brain damage, and Magneto got her to a hospital via the O*N*E troops who had landed on the island. There Callisto recovered as the Mists' effects wore off, and it's assumed she remained human.
Afterwards, Cal got involved with the X-Cell, a group of depowered mutants who believed the government caused their loss
of powers. She became the bodyguard for the group's leader, and prevented him from being repowered by Quicksilver when they met with him in Mutant Town.
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