Apocalypse World

The Apocalypse World is a universe that could have only come about had Mary Campbell refused to make a deal with Azazel, which ensured her boyfriend John Winchester remained dead and their future children, Sam and Dean Winchester, were never born.

History
After John Winchester is killed by Prince of Hell Azazel, Mary refuses to make a deal to bring John back. Mary remains alone and a Campbell for the rest of her life, rendering her future, pre-destined sons Sam and Dean Winchester as non-existent.

In this reality, Heaven and Hell go head to head in a war, almost eliminating the entire human race and decimating the Earth. The Archangel Michael has also defeated and killed Lucifer in combat, making him the victor.

By 2017, one of the surviving humans is Bobby Singer, who is equipped with angel-killing bullets. In this universe, a class of demons known as Tempter demons exist.

Season 12
While his mother Kelly Kline goes into labor, the Nephilim Jack opens a portal that leads to this alternate universe. His protector Castiel falls into it and meets Bobby Singer there. He manages to escape and show this world to Sam and Dean. When Lucifer arrives in hopes of claiming his son, Sam, Dean, Castiel and Crowley decide to use this portal as a means to lock Lucifer away.

Crowley chooses to sacrifice himself as part of a ritual that will seal the rift. Unfortunately, Lucifer manages to escape and kill Castiel. He is forced back into the rift when Mary Winchester attacks him and both end up trapped.

Aftermath
The state of this world encourages Sam and Dean to believe that they are indeed heroes who have saved the world, preventing it from becoming what it did in that universe. The major downside is Mary's absence, as well as Castiel's and Crowley's death.

Season 13
In Lost & Found, in the new world Mary runs from Lucifer who easily keeps up with her, reminding Mary that he can fly so she can't outrun him. Mary challenges Lucifer to kill her and he agrees, throwing Mary towards a sword sticking up out of the ground. However, at the last moment, Lucifer telekinetically stops Mary's fall. Grabbing Mary, Lucifer suggests that he needs her alive.

In The Rising Son, Mary follows Lucifer across the wasteland while doubting their chances of escaping. When Lucifer expresses his concern for his son's well being, Mary doesn't believe he could care about raising kids. After attempting to explain himself, Lucifer decides she simply doesn't know him. A bomb is seen flying towards them and Lucifer covers himself using his leather jacket. Once the smoke dissipates he finds Mary gone. He finds her about to be killed by a hunter and promptly punches the hunter through the chest, killing him. Lucifer complains about Mary running away again and suggests that they should be working together in order to reunite with their respective sons. When Mary argues that she does not wish to help Lucifer win, Lucifer forces her to comply by causing her to convulse in pain.



The two continue walking along the wasteland until Mary complains about being tired. Lucifer doesn't let her rest, pointing out that she is the reason they are here and it's not his fault she's a "wimpy human". The two are interrupted by the arrival of a group of angels in search of a creature from Hell. Lucifer jokingly suggests they are referring to Mary to which the angel replies with "False!" When Lucifer tells them who he is, the angel again replies with "False!" since the Lucifer of their universe has been slain by the Archangel Michael.



When the angels prepare to smite Lucifer, Lucifer angrily snaps his fingers and obliterates them. He and Mary are almost immediately after approached by the Archangel Michael himself, who is surprised to see his brother alive until he learns they are from another reality. Lucifer thinks this Michael is a knockoff of the one he left in The Cage, to which Michael responds by explaining what he did to his own Lucifer. Michael wishes to do the same thing again, leading Lucifer to punch him in the face. The two archangels get into a fist fight while Mary watches. Michael quickly gains the upper hand by twisting Lucifer's arm.

When Lucifer asks if Michael plans on killing him, Michael tells him he will keep him alive because he needs him.

In War of the Worlds, Lucifer is shown being bound inside a cage full of spikes used to torture him. Michael also reads his mind and discovers the world Lucifer left behind is a paradise he wishes to visit himself. Michael tells Lucifer that once he is done using him, he will abandon Lucifer inside this cage knowing it is the thing Lucifer fears the most, as it reminds Lucifer of the Cage in Hell.

Lucifer is taken out of the cage temporarily to be used in a ritual meant to create a rift that will take Michael back to Lucifer's world. Lucifer is shocked to learn that the Kevin Tran of this universe is working with Michael and is the one to perform the spell. Lucifer questions Kevin's decision to serve a monster, but Kevin retorts that Lucifer is the monster since he is Satan, and Michael is the closest thing to God and being a prophet Kevin is obligated to serve him.

When Kevin reveals an ingredient needed to power the spell is the grace of an archangel, Michael extracts a portion of Lucifer's grace and gives it to Kevin, intent on leaving the rest inside Lucifer for future use. Kevin activates the spell and a rift is formed, but Lucifer makes a quick run for it and succeeds in passing through alone. The rift closes behind him. Michael then tells an ecstatic Kevin to try what he did again so he could head to that realm. After returning to his world, Lucifer makes contact with his resurrected brother Castiel and tells him of the invading Michael before they are captured by Asmodeus, the current Ruler of Hell. Asmodeus then makes plans to locate and procure Jack if there was truth about the invading Michael.

In The Bad Place, Lucifer's son Jack tried mastering his powers before making contact with a dreamwalker named Derek Swan in order to see other worlds. Jack's effort prove somewhat successful as he able to see the Alternate Reality and Mary Winchester being held prisoner begging for aid. Sometime later, he is able to show Mary's sons this sight and they set out to track down another dreamwalker Kaia Nieves. After saving her from angels and threatening her until she was turned to their side, Jack and Kaia were able to combine their powers and navigate through the dimensional plane until they found the world Mary was in. Due to the stress as well the attacking angels, everyone was sent to other areas with Jack alone ending up in the world with Mary.

Angels

 * Archangels
 * Michael
 * Lucifer  (mentioned only; deceased; killed by Michael)
 * Angel Commander (deceased; killed by Lucifer)
 * Zachariah

Demons

 * Tempter Demons
 * Prince of Hell
 * Azazel

Humans

 * Hunters
 * Bobby Singer
 * Rufus Turner
 * John Winchester (mentioned only; killed by Azazel)
 * Mary Campbell (mentioned only; killed by Azazel)
 * Unnamed Hunter  (deceased; killed by Lucifer)
 * ​Prophet
 * Kevin Tran

Appearances

 * Season 12
 * All Along the Watchtower
 * Season 13
 * Lost & Found
 * The Rising Son
 * War of the Worlds
 * The Bad Place
 * Only the Best Intentions

Major Changes

 * Mary says no to Azazel, which means John stays dead and Sam, Dean and Adam are never born.
 * Kevin Tran, Bobby Singer, and Rufus Turner are still alive.
 * Michael is much more powerful than the one from the Main/Prime Universe, or at least more ruthless.
 * Michael isn't trapped in Lucifer's Cage nor insane.
 * Lucifer was killed by Michael.
 * According to the alternate Kevin Tran, there is no God to serve in the alternate universe and that Michael is effectively the new God. This implies that this universe's God either abandoned his ruined Creation or was slain in the war somehow.

Trivia

 * This universe is similar to the alternate universe of 2014, since both universes depict the world being ravaged by war involving at least one archangel.
 * This is the fourth known alternate universe on the show with the one in The End, The French Mistake, and My Heart Will Go On being the first three.
 * This is the first alternate universe to be featured in multiple episodes.
 * This is the second alternate universe to feature an alternate Archangel, with The End being the first one.
 * The giant spikes found in this world are actually giant angel blades.