The story revolves around the origin of Mystery Inc and their first case together. Before becoming friends, the members of Mystery Inc. live in separate social circles. Its only when the school jock Fred, the popular Daphne, brainy Velma and social outsider Shaggy, along with Shaggy’s new dog Scooby Doo find themselves accused of vandalizing their high school that they come together to clear their name and uncover the truth about the Coolsville High School haunting.