X-Men and the Avengers: Friend or Foe?

Read X-Men and the Avengers: Friend or Foe? Storyline:

The greatest super-teams ever assembled: the X-Men -- mutant protectors of a world that fears and hates them -- and the Avengers -- Earth's mightiest heroes. Now they have joined forces with the incredible Hulk against the deadly leader, having traced him to his base on the moon...