Scooby Doo and the Mystery, Inc., gang travel to Scotland to help Daphne's cousin with the Highland Games, but they become distracted by a rash of sightings of the Loch Ness monster.
Scooby-Doo and his friends volunteer at an animal shelter, and when one of the dogs appears to be a werewolf, Scooby, Shaggy, Fred, Velma, and Daphne try to get to the bottom of it.
Fred and Velma want to debunk the stories of ghosts and ghouls at Crystal Cove after the kids of Mystery Incorporated arrive in the small village, but the locals do not seem anxious to have their mysteries solved.