Alternate Universes

An Alternate Universe is a deviant or alternative plane of reality within the flow of space and time that exists outside of the mainstream flow of events.

Known Alternate Universes

 * The French Mistake (Supernatural is just a TV show)
 * All Along the Watchtower (Mary Campbell refused to make a deal with Azazel)
 * My Heart Will Go On (Balthazar stops the Titanic from sinking)
 * The End (Sam said "Yes" to Lucifer)
 * The Bad Place (The world appears to be ruled by monsters)

Appearances

 * Season 5
 * The End 
 * Season 6
 * The French Mistake
 * My Heart Will Go On
 * Season 12
 * All Along the Watchtower
 * Season 13
 * Lost & Found
 * The Rising Son
 * War of the Worlds
 * The Bad Place

Trivia

 * Mary Winchester is currently (as of The Bad Place) trapped in an alternate universe with Lucifer. However, Lucifer managed to escape in War of the Worlds.
 * Virgil is the first and longest character to be trapped in an alternate universe
 * Dean is the only one to visit all five.
 * The The French Mistake is the only known universe without magic. A Goblet of Blood still works here though and can reach someone in the main reality.
 * While using Kaia's powers in an attempt to locate Mary Winchester, Jack sees windows into several different realities, one of which appears to be a paradise.