X-Factor #69 (1991) (High Grade)

Muir Island is in turmoil due to the influence of the Shadow King. X-Factor gets called in to make an assault on the Shadow King's nexus. The primary problem, however, is getting past the Shadow King's army of X-Men. Professor X is back in action as he goes against the very reason he started the X-Men. But it seems like allies are even scarcer than first thought.