Ash's Adventures of Scooby-Doo! The Mystery Begins is the first Pokemon/Scooby-Doo crossover film planned to be re-edited by Daniel Esposito. It will appear on Google Drive near the future.
Ash and his friends (along with SpongeBob and his friends) travel to Coolsville and meet four teenagers named Shaggy, Fred, Daphne, and Velma and a dog named Scooby-Doo. When the school is taken over by three ghosts, whom Team Rocket and Plankton work for, Ash, Pikachu, Misty, Togepi, Brock, SpongeBob, Patrick, Squidward, Sandy, Mr. Krabs, Scooby-Doo, Shaggy, Fred, Daphne, and Velma must team up to solve their first mystery.
- SpongeBob SquarePants, Patrick Star, Squidward Tentacles, Sandy Cheeks, Eugene Krabs, and Sheldon J. Plankton will guest star in this film.
- Sheldon J. Plankton and Team Rocket (Jessie, James, and Meowth) will work for the three ghosts in this film.
- This is one of the only two Pokemon/Scooby-Doo movies guest starring SpongeBob and his friends and Plankton, the next being Ash's Adventures of Scooby-Doo! Curse of the Lake Monster, due to RatiganRules guest starring SpongeBob and Patrick in his Winx Club/Scooby-Doo films in the near future. But the only reason why they're in this film and Ash's Adventures of Scooby-Doo! Curse of the Lake Monster, is because RatiganRules has no plans to do Winx Club crossovers with Scooby-Doo! The Mystery Begins and Scooby-Doo! Curse of the Lake Monster.