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Crossover Alternate Universe

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Some crossovers start a storyline in one piece of media and finish it in another. Others bring existing characters to the same place. A crossover alternate universe is where a universe is created solely for the purpose of bringing together characters for whom the above two options aren't available.

This usually happens for one of the following three reasons:

1. A fake crossover is needed. The writers can't simply transport all the characters to an existing universe due to plot necessities or copyright reasons.

2. The original work is not ongoing. It would be impossible to have the characters pop up in existing stories. This is common in Fairy Tale Free For Alls and other works involving public domain characters.

3. The writers need to give the characters backstories different from what they are in their original stories.

Usually (but not always), the universe isn't used again after the crossover finishes. Subtrope of Alternate Universe. Se also Adaptation Amalgamation.


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    Anime and Manga 

    Comic Books 

    Films — Animation 
  • Played with in Spider-Man: Into the Spider-Verse. The universe is separate from any existing continuity (it was created for the movie) and doesn't initially appear to be a crossover, but that changes about 40 minutes into the film when the other Spider-Men are brought in from other universes.

    Films — Live Action 

    Live-Action TV 
  • Super Sentai:
    • The main characters of non-canon spin-off Hikonin Sentai Akibaranger, who are Super Sentai fans, can conjure a delusional dimension where every Super Sentai team exists.
    • Kikai Sentai Zenkaiger, which does away with the long-standing Shared Universe concept to give each Sentai their own universe, strongly hints that the world of Kaizoku Sentai Gokaiger, which was rooted in the Shared Universe more than any other, is one of these; a recurring depiction of all the Super Sentai universes in Zenkaiger has them being represented by team images (as pictured above), the Gokaigers' showing them standing in front of all their predecessors. This indicates that the Gokaiger world has its own versions of the first 34 Super Sentai, justifiable since Gokaiger itself hinges on their existence (one of the Gokaigers' key powers is the ability to assume the forms of previous Super Sentai). This was later expanded to include post-Gokaiger Sentai, with the 10th anniversary Reunion Show Kaizoku Sentai Ten Gokaiger affirming the existence of the 9 Sentai succeeding the Gokaigers.
      • The final episodes of the show also mention a "Super Sentai World" where ALL the shows take place that is distinctively different from the Gokaiger world. It's also mentioned in side material that even though every team has a world where they were the major team in it, it doesn't necessarily mean other Sentai teams didn't also happen in the backstory, ranging from Kiramager having Gekiranger to Zyuohger having Gokaiger and thus all the other teams as well. The sequel, Donbrothers, also throws in the idea of other universes having alternate versions of previous Sentai characters, with Zenkaiser Black, an AU of Zenkaiger's main character Kaito with a distinctly different personality, as a supporting character.

    Video Games 

    Web Animation 
  • It appears that in Sonic for Hire, the universes of every video game in existence co-exist with each other. While for the most part, the characters featured in the series stick to the roles they have in their respective games, there are numerous other characters who have grown out of their original roles. For starters, the eponymous Sonic is now living in an apartment and has to resort to finding jobs to make ends meet. Additionally, Knuckles is the owner of a BurgerTime restaurant, Eggman is less evil, and Mario is now a mob boss.

    Web Videos