X-Men and the Avengers

The X-Men-mutant protectors of a world that fears and hates them, and the Avengers-Earth's mightiest heroes, team up with the Incredible Hulk to track down the evil Leader to his base on the moon. Fighting not only his dangerous Gamma Sentinels, but also each other, each team must work through their differences in order to save not only their teammates, but the entire world as well.