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The X-Men face off against the Outcast - and it's not this guy, bitch! It's a long story why Cain Marko, the Juggernaut, and Professor Charles Xavier are stepbrothers, but what makes Marko a Juggernaut is the Crimson Gem of Cyttorak. His helmet protects him from Xavier's powers. He has natural and force-field-augumented Hulk-level strength.