The Uncanny X-Men vs. Magneto. The uncanny X-Men were formed, and their first mission brought them to a direct confrontation with Xavier's old friend, Magnus, now the self-styled "Master of Magnetism" Magneto, who would become their most frequent adversary.The conflict took place in Cape Citadel, in a military base Magneto had claimed.This was the first clash of Magneto and Xavier's rivalling ...