The X-Men are summoned by Professor X to discuss another evil mutant that has appeared on the scene. After updating them on the Vanisher, they engage in some training to evaluate how they work together with their newest member, Marvel Girl. The Vanisher intends to steal defense plans from the Pentagon. After contacting FBI Agent Fred Duncan, The X-Men have their first encounter with the villain trying to stop his plan, but he escapes with the plans none the less. The X-Men are ready the next go round. The Professor turns off the mutantís power telepathically and the X-Men capture him and his squad of thugs.