Alternate universes

Parallel universes are universes of similar nature and conception as ours. With notable differences, though. The universe that is ours does not have an official name, though it was coined as "Universe A" by the Planet Express crew, and as "Universe Gamma" by Yivo.

Known Universes
This is the list of parallel universe as they have been mentioned on the show and in the films. Should be noted that the names in italics are non-official names (i.e. their name is never actually mentioned).
 * Cowboy Universe
 * The first parallel universe shown, that was created simultaneously by the Medium-Sized Bang. In this universe, everybody dresses as cowboys.  Until the events of, it was thought the only other existing parallel universe.


 * Universe 1
 * The main difference in this Universe is that coin flips end up differently, and boxes are blue.


 * Icy Universe.
 * Women Universe.
 * Octopus Universe.
 * Universe 25
 * In this one, nobody have eyes, and boxes are white.


 * Universe 1729
 * Everybody are bobble-heads, and boxes are pink.


 * Universe 31
 * The humans are robots, and robots are possibly humans. Boxes are green.


 * Universe XVII
 * A universe where everything looks like the Roman Empire. Boxes are purple.


 * Leprechaun Universe.
 * Pirate Universe.
 * Universe 420
 * Everybody are hippies and smoke marijuana. They have a shortage of boxes, which are orange.


 * Yivo's Universe
 * The universe where Yivo lives by shklerself and Colleen. Interestingly, while all the other parallel universes mimics our universe in some fashion, this universe does not.  It is entirely different, and according to Yivo, this universe is older than ours.