This is #1. It's going to the very first Scooby-Doo to Scooby Doo 2: Monsters Unleashed.  So there are 4 movies

Scooby Doo

Scooby-Doo 2: Monsters Unleashed

Scooby-Doo: The Mystery Begins

Scooby-Doo: Curse of the Lake Monster

Go ahead and choose a movie and we'll rp it!