Multiverse

A multiverse is a seemingly infinite collection of universes. Travel between universes requires extremely potent science or magic, but extraordinary heroes and villains have accomplished it many times. Though a given multiverse is infinite, it does not encompass all of existence: infinite multiverses exist, totally detached from each other. No explicit record exists of anyone traveling from one multiverse to another. Every multiverse is contained within the megaverse.

See also

• Multiverse on Wikipedia