Marvel Universe: Battleworld Avengers-1
What if the mightiest superheroes and villains of all time were transported to a strange patchwork planet by a force from beyond the universe to fight a Secret War? And what if, years ago the war ended... but no one came home?
This is what happened in this alternate version of the Marvel Universe. The heroes and villains laid down their weapons after Galactus and The Beyonder had slain each other and decided to focus on their similarities rather than their differences. Then, also, they began to have children and... as those children matured, the battle began again.