X-Men / Fantastic Four #3

Synopsis

Four of the X-Men and two of the FF have been bathed in the same kind of cosmic radiation that originally created the Fantastic Four as they crash to Earth. As their teammates rush to the scene, they find that Sue and Ben are all right, but the X-Men have gained powers similar to the FF on top of their mutant abilities and it has made them violent. Wolverine has stretching powers, Emma has turned rocky, Gambit has flame powers and Nightcrawler turns invisible. The FF and the remaining X-Men battle their former friends and capture three of them, but Wolverine escapes. The Brood arrive on earth.