Nightmare Irk

When Dib's head temporarily opened a transdimensional portal in the Halloween Spectacular of Spooky Doom, he had actually opened a wormhole into a parallel universe. This galaxy is identical to the one that Earth and Irk reside in, save for the fact that it's a dark, evil, shadowy version of our universe.

However, it wasn't always like this. The Nightmare Dimension was once a heavenly utopia. That is, until a Leviathan seed (see Wikitroid) crashed into Alternate Irk. The Phazon inside it went rampant, mutating so that its corruption could reach other planets on its own. The Utopian Universe became