Negaverse

The Negaverse is an alternate universe that appears in the Darkwing Duck episode "Life, the Negaverse, and Everything", home of the villainous Negaduck.

Background
The Negaverse is basically a parallel universe of St. Canard where everything is the opposite of the the regular universe. In this universe it is a dark apocalyptic world where crime rules the streets, the villains are the good guys and Negaduck is the supreme ruler who causes unnecessary pain and suffering unlike his good counterpart.

The portal to the Negaverse was inside a huge birthday cake hidden in a bakery.