Uncanny X-Men #280 (September 1991) by Marvel Comics
Muir Island Saga: Part 4 of 4. "One Step Back, Two Steps Forward!" Guest-starring X-Factor. Story by Fabian Nicieza. Art by Andy Kubert and Steven Butler. Story continued from X-Factor (Vol. 1) #69. The original X-Men unite with the new for the final showdown with the sinister Shadow King. This is one battle not everyone will be "walking" away from.