Littlefoot's Adventures of Scooby-Doo! The Mystery Begins

'Littlefoot's Adventures of Scooby-Doo! The Mystery Begins' is the first Land Before Time/Scooby-Doo crossover film planned to be re-edited by yru17. It is planned to be shown on YouTube after Littlefoot's Adventures of Pokémon 3: The Movie.

Plot
Littlefoot and his friends (along with Stan, Kyle, Cartman, and Kenny) time-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, Littlefoot, Cera, Ducky, Petrie, Spike, Chomper, Ruby, Guido, Stan, Kyle, Cartman, Kenny, Scooby-Doo, Shaggy, Fred, Daphne, and Velma must team up to solve their first mystery.

Trivia

 * Stan, Kyle, Cartman, and Kenny guest star in this film.
 * This is the first Littlefoot's Adventures film to only feature one series of guest stars.
 * Ash, Pikachu, Misty, Brock, and Togepi were originally supposed to guest star in this film, but yru17 found out that Disneydaniel93 will start making a Pokémon/Scooby-Doo movie with Ash's Adventures of Scooby-Doo on Zombie Island and yru17 had a feeling that this film might mark the first time Ash and the gang meet Scooby-Doo and the gang, so he decided to cut them out.
 * SpongeBob, Patrick, Squidward, Sandy, and Plankton were originally also supposed to guest star in this film as well, but yru17 found out that ratiganrules is already planning the guest star SpongeBob and Patrick in his Winx Club/Scooby-Doo movies starting with Bloom's Adventures of Scooby-Doo on Zombie Island and yru17 had a feeling that this film might mark the first time Ash and the gang meet Scooby-Doo and the gang, so he decided to cut them out, too.