X-Men [Professor X (origin); Cyclops; Marvel Girl [Jean Grey]; Angel; Iceman; Beast]; Sharon Xavier (flashback); Kurt Marko (flashback); Juggernaut (villain, origin)
Synopsis
Cerebro detects a powerful mutant and Xavier fears that he knows who it is. The X-Men prepare the mansion for an all out assault. As the mysterious villain batters his way through the mansion's defenses, Professor X tells his students his origin story and how his stepbrother changed from tormenting bully to an unstoppable Juggernaut.