WORLDS COLLIDE! It starts here—the long-promised clash between the Avengers and the Champions! The countdown has started as the High Evolutionary sets the Earth on a collision course with destruction! The Avengers and the Champions are ready to meet this threat—but not everyone agrees how best to combat it! Since they were old enough to say the word ""Avengers,"" the Champions have idolized Earth's Mightiest Heroes. Now the two teams are on equal footing—and the Champs are having to walk the walk alongside their former mentors! Will their experiences in GENERATIONS help them-or tear the two teams apart? COLLECTING: AVENGERS 672-674, CHAMPIONS 13-15