Book was a mutant from Kingston with a brilliant mind but physically limited by his unsupportable mass. He was being used for minor gambling predictions when Javier Belize found him in Kingston and brought him to Mexico and the Quetzalcoatl Corporation. Belize provided Book with a zero-gravity environment to support his weight and view screens to feed his lust for knowledge. Book was still a slave to Belize's needs, however, and conspired to arrange his own release. Book contacted Halo City and helped the X-Men Meanstreak, La Lunatica, and Fitzgerald rescue him from Belize.
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