Friend or Foe? (X-Men and the Avengers: Gamma Quest Trilogy, #3)

The X-Men--mutant protectors of a world that fears and hates them. The Avengers--Earth's mightiest heroes, the greatest super-team ever assembled. Now they must put aside their differences and join forces against the Leader, the gamma-powered evil genius who has already abducted one Avenger and two X-Men as part of his latest plan--with the fate of the entire globe at stake!

* Illustrations by George Perez and cover art by Julie Bell