The old split personality storyline here, as a terrifyingly powerful psychic entity declares war on the X-Men, seeming to know everything about them, setting mutant against mutant: adapting the Onslaught storylines for an X-Men film should be a doddle. Its revealed that Onslaught is in fact a dissociative identity hidden within Charles Xavier. Magneto, missing throughout the events of the film, is found to be languishing in a secret room in the mansion, catatonic: months earlier, the two had argued over Genosha and the magnitude of nuclear weapons, and Magneto had claimed that homo superior didnt have half the ability to destroy the world that homo sapiens had several times over with their nuclear arsenal. In a mad moment, Magneto had threatened to steal and detonate a nuke over the former mutant slave state to teach humanity a lesson on the nature of the weapons that they were stockpiling and Xavier had looked inside his old friends head, had panicked, sure that he meant it, and reached out and simply turned his mind off. In that moment, the seeds of Onslaught were born, the psychic feedback of guilt and remorse combining with the worst of Magneto and Xaviers subconscious minds to create a new, distinct personality whose only mission was to create the kind of destruction that both Magneto and Xavier would find repugnant in real life. Its essentially the Dark Phoenix saga for Professor X, and its perfect for the kind of cast that the X-Men movies have already put together.
Professional writer, punk werewolf and nesting place for starfish. Obsessed with squid, spirals and story. I publish short weird fiction online at desincarne.com, and tweet nonsense under the name Jack The Bodiless. You can follow me all you like, just don't touch my stuff.