Peter's family always remained in his thoughts and he frequently wrote letters home. Shortly after joining the X-Men, a woman known as Miss Locke kidnapped many of the team's loved ones to force the X-Men to help her free her employer, Arcade, from captivity by one of Doctor Doom's robots. Among her captives was Colossus' younger sister Illyana, whom Locke had kidnapped from the Siberian collective farm and transported to the United States. Arcade brainwashed Colossus into becoming "The Proletarian", who then battled the other X-Men until they countered the brainwashing. The X-Men freed Illyana from captivity, and she went to live with her brother Peter at Xavier's mansion. She was later held captive in a dimension known as Limbo, where she spent years while only mere moments elapsed on Earth, and became the adolescent sorceress Magik. As a result, an alternate-timeline version of Colossus dies in Limbo.