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History: Cain Marko has wasted his entire adult life attempting to escape the shadow of his stepbrother, Professor X. Cain's father married Charles Xavier's widowed mother, presumably for her wealth, and took up residence in the family's Westchester mansion. A cruel and spiteful boy, Cain came to live with the family shortly thereafter. Cain grew to hate his new stepbrother, mostly because his father favored Charles, and took to bullying the younger boy. As punishment, Cain's father beat him. Inexperienced at the use of his fledgling telepathic abilities, Charles could not control or terminate his contact with Cain's mind during these periods of pain. Somehow, Cain sensed that Charles had invaded his thoughts. Believing he had done so deliberately, Cain came to regard his stepbrother as an enemy. Over time, Cain grew increasingly resentful of Charles' scholastic and athletic achievements, and envious of his telepathic talents. Drafted into military service, Cain served in the same unit as Charles. When Cain deserted under fire, Charles pursued his stepbrother, hoping to convince him to return of his own accord. Charles followed Cain into a cave that housed the lost temple of Cyttorak, a powerful mystical entity. Lured by greed and delusions of grandeur, Cain unearthed a large red ruby. Empowered by the gem, he was transformed into a superhuman being. Just then, an enemy bombardment caused a cave-in. Charles escaped, but Cain was buried under several thousand tons of rock. Eventually, he dug himself free with his newfound powers and made his way to America. Lacking his stepbrother's moral fiber, Juggernaut turned his newfound strength against Charles and his X-Men. Each time they clashed, the heroes managed to beat back his bull rush. Often, Juggernaut worked with mutant terrorist Black Tom Cassidy, whom he befriended while in prison. Cain remains little more than a super-powered thug. For all his physical strength, Juggernaut lacks strength of character. Despite his yearning for power, he has squandered his supernaturally enhanced abilities out of petty jealousy. Still, Charles holds out hope that Juggernaut will one day gain a better sense of understanding for the mutant plight, if not acquire a newfound respect for life and human dignity.