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.
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