Caliban first appeared as one of the many mutants tricked into coming to Genosha before being forced to work on the Dam that would power Master Mold.[1]
Caliban was transformed by Fabian Cortez into one of Apocalypse's Hounds, until Jubilee made Caliban turn against Cortez and the rest of the Hounds, who sought out a mutant to use as a new host body for Apocalypse's reincarnation.
When the Multiverse was destroyed in the last incursion between Earth-616 and Earth-1610, Doctor Doom, with Beyonder's powers, recreated it in the form of Battleworld. Earth-92131 was recreated in the Westchester domain, ruled by Baron Kelly.[3]
The Shadow King realized that in comparison to those other domains, Westchester was a fragile paradise, and set out to ensure its survival by any means. Using the cloned body of Professor X, the Shadow King became Cassandra Nova, and used his new identity to become a politician and establish the Bureau of Super-Powers.[4]
At the Clear Mountain, Cassandra Nova used a form of psychotherapy called the "Mind Field" to brainwash those mutants who arrived to the institute and force them to live in harmony, unlike most of the other mutants, Caliban and a few other more monstrous looking mutants were kept in a separate room and called the Rej-X, deemed not fit to integrate into the human society because of their looks.
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