When Mutants and Witches Meet is a The Owl House and Teenage Mutant Ninja Turtles (2012) crossover fanfiction story. The story diverges from canon for the former at the end of “King’s Tide”, when the portal malfunctions and sends the Hexsquad to New York City, where they promptly meet the Turtles.
- Adaptational Gender Identity: In this AU Leo is a trans girl and Donnie is non-binary.
- An Arm and a Leg: Splinter lives in this AU, but loses an arm.
- Spared by the Adaptation: Splinter survives the Shredder's attack in this AU, albeit at the cost of losing an arm.
- Trapped in Another World: Luz and the Hexsquad are sent to the New York City where the Turtles live.