Cain Marko’s mother died when he was very young, leaving him to live a life of psychological and physical torment at the hands of his abusive father, atomic researcher Doctor Kurt Marko. Following the death of his colleague Doctor Brian Xavier, Kurt married Xavier's widow Sharon and he and Cain took up residence in the Xavier's Westchester mansion with Sharon and her young son, Charles.
Kurt seemingly preferred Charles to his own son, which consumed Cain with jealousy and he took to bullying his stepbrother. Cain's father continued to beat him, but Cain did not suffer the abuse alone. Inexperienced at the use of his emerging mutant telepathic powers, Charles shared the pain and inadvertently learned of Cain's jealousy towards him. This only ensured that Cain would forever hate Charles for his unwitting betrayal.
Location
This villain is encountered during Chapters 5 and 8.
