DC Comics revolutionized the multiverse in superhero comics and gave readers some of the best alternate universe counterparts ever.

The world of Gravity Falls has grown into one of Disney’s most beloved original universes, and fans still aren’t ready to let ...

While there are all sorts of alternate versions of iconic heroes in the DC Universe, some aren't heroes; they're villains.

In the season 2 episode “Mirror, Mirror,” Star Trek perfected the alternate universe trope long before Hollywood became obsessed with the unlimited franchise-expanding potential of a multiverse.