[[File:Multiverse.png|500px|thumb|right|The Multiverse as seen by Kaia and Jack in [[13.09 The Bad Place]]]]
An alternate universe {{Quotation|title= |text='''Sam:''' How many are there -- how many other worlds or -- or universes or realities or alternate reality occurs when accepted reality is alteredwhatever?<br>'''Chuck:'''I don't know. Kinda lost count. Most of them are boring. One's in reverse. In one, there's no yellow. One of them's just all squirrels.|author= |source= [[14. Characters may actually move into 20 Moriah]] } [[God]] aka Chuck has created many worlds within a universe that is multiverse. While usually separate , they can sometimes be accessed via [[portals]]. These worlds may be very different from their ownEarth or similar with minor changes. In addition to these alternate worlds, they Characters may find themselves in a an [[alternate reality ]] constructed by a powerful being or induced by a drug, or they may find their own universe altered by [[time travel]].
==Alternate Universes and Other Worlds ==
'''Episodes:''' [[13.17 The Thing]]
==Episodes Featuring Altered Reality or Alternate Timelines=====[[2.20 What Is and What Should Never Be]]===A [[djinn]] poisons [[Dean]] and traps him in a dream state while it feeds from his blood. This AU is commonly referred to as the [[wish-verse]]. It is a construct formed by Dean's subconscious arising from one wish - that his mother had never died. As a result, [[Mary Winchester]] is alive in the present day, with Sam still attending Stanford and engaged to [[Jess]] while Dean works as a mechanic and dates a nurse, but John Winchester is still dead, Dean and Sam have a poor relationship, and everyone the Winchesters saved as hunters are dead. ===[[3.10 Dream a Little Dream of Me]]===[[Jeremy Frost]] is able to trap people in their dreams by mixing some of their DNA with [[African Dream Root]]. What happens in the dreams affects the dreamer - including death. ===[[3.11 Mystery Spot]]===The [[Trickster]] creates a [[time loop]] in which [[Dean]] dies in every iteration regardless of what [[Sam]] does. When the [[Trickster]] is discovered by Sam, he ends the loop with Dean dying. Sam spends six months searching for the Trickster. When he finds him, Sam begs him to bring Dean back. The Trickster says he was trying to teach Sam that Dean is his weakness, and his enemies will use this against him, but he does restore the original time line. Dean does not remember his final death, although it is unclear if Sam remembers the previous six months. ===[[4.17 It's a Terrible Life]]===[[Zachariah]] creates an alternate reality where the Winchesters are [[Dean Smith]] and [[Sam Wesson]], two men who are not brothers, and who work for [[Sandover Bridge & Iron Inc.]]. They eventually team up to hunt a ghost in the building. At a time when Dean seems to recoil from hunting, Zachariah constructed the reality to demonstrate to Dean that he will always pursue hunting. This reality is simply constructed out of false memories and is not truly alternate per se. ===[[5.04 The End]]===[[Zachariah]] creates a future alternate reality where [[Sam]] and [[Dean]] are no longer hunting together and haven't been for five years. It's the year 2014 and most of the population are either dead or have become [[zombies]] due to the [[Croatoan virus]]. ===[[5.08 Changing Channels]]===The [[Trickster]] traps [[Sam]] and [[Dean]] in a reality based on TV shows and advertisements. The boys finally expose him as the [[archangel]] [[Gabriel]], who is trying to teach them to play their roles as [[Lucifer]] and [[Michael]]'s [[vessel]]s. ===[[6.17 My Heart Will Go On]]===On [[Castiel]]'s command, [[Balthazar]] goes back in time and stops the Titanic from sinking. This has side effects, changing reality in many ways - [[Bobby]] and [[Ellen]] are married, [[Dean]] drives a [[Dean's Mustang|mustang]], and Cuba is a popular American holiday destination. A confrontation with [[Fate]] leads Castiel to reversing the effects, but he leaves Sam and Dean with the memory of what happened. ===[[7.10 Death's Door]]===After being shot in the head by [[Dick Roman]], [[Bobby]] must revisit old memories to try and survive. He remembers a hunt with [[Rufus Turner]], his childhood, the last argument he had with his wife [[Karen Singer|Karen]], and times with young [[Dean]]. ===[[12.13 Family Feud]]===As a result of [[Abaddon]] abducting [[Gavin MacLeod]] from 1723, he never boards ''The Star'' as he is destined to and never dies when the ship sinks. As a result, his fiancé [[Fiona Duncan]] boards the ship looking for him and, unprotected without Gavin, is brutalized by the crew who are encouraged by her teacher. After the ship sinks, Fiona becomes a [[vengeful spirit]] targeting and murdering teachers in the present day. To set things right, Gavin agrees to return to his own time to protect Fiona on the ship and die as he was supposed to when it sinks. After Gavin's return to 1723, the Winchesters discover that Fiona's murders in the present have been erased from existence, showing that Gavin succeeded. Only Sam, Dean, [[Crowley]], and [[Rowena]] appear to remember the alternate timeline where Fiona had become a vengeful spirit. ===[[14.13 Lebanon]]===While trying to use the [[Baozhu]] to get rid of [[Michael (Apocalypse World)|Michael]], Dean inadvertently pulls [[John Winchester]] from 2003, creating an alternate timeline due to John's disappearance in the past. As a result, [[Castiel]] remains a loyal and unquestioning soldier of [[Heaven]], [[Mary Winchester]] is still dead, [[TED Talk Sam|Sam]] never left Stanford and became an Internet famous lawyer, and Dean remains a hunter but is wanted by the law. Additionally, the Apocalypse never happened, with [[Zachariah]] noting that Heaven had "big plans" for the Winchesters before John disappeared. After an encounter with the alternate Zachariah and Castiel, the Winchester family decides to return John to 2003 and unwind this timeline, leaving John with no memory of the experience beyond thinking it to be a really good dream.
==AUs in Fanfiction==