The most powerful,Non-cosmic, members of the Marvel Universe, DC Universe, Image, Darkhorse, etc. Universes, are put together on an uninhabited Earth-like world in a completely brand new universe.
This is the top 5%, power-wise, from each Comic Book publishers universe, no character duplication, and they are stuck together in this brand new universe. They can't go back, no matter how powerful they are.
Note-this is not just heroes, But all including villains.
How do you see this working?