The Nightmare Before MediEvil is a fanfiction crossover Halloween special written by MarioFan65. This story is a crossover with The Nightmare Before Christmas and MediEvil. It was released on October 9, 2018.
- Sir Daniel
- Jack Skellington
- Oogie Boogie
- Chapter 1: A Spooky Beginning
- Chapter 2: Skeleton Friends
- Chapter 3: Monster Hunt
- Chapter 4/Epilogue: This is Halloween
- This is the first Crossover Omniverse Saga special to not start off first as a full fanfiction story like the Club Penguin and Happy Feet stories and the Shantae and Aladdin stories.
- This is the first Crossover Omniverse Saga special without the title of the holiday special next to the crossover title.
- The story is a prequel to the entire Crossover Omniverse Saga, taking place 111 years before the actual events of the mainline crossover stories like Mario and Spyro and Club Penguin and Happy Feet.
- Coincidentally, a parody poster of Sir Daniel Fortesque in a Nightmare Before Christmas setting was released a year later in favor of the MediEvil PS4 remake.
- The first MediEvil was in development back then for PlayStation and has influence to The Nightmare Before Christmas.
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