This was Scooby Doo's first movie. In it Shaggy's uncle dies and leaves his house to Shaggy. So has the movie opens, we meet Shaggy, Scooby and Scrappy Doo (Scooby's nephew). Oncle there Shaggy learns that his uncle has left him the family jewels along with the house and a series a clues to find the next clue and a jewel.
The city's police officer finds the family jewels nothing but a bunch of "hooey." But it's the house it haunted. So Scrappy looks in a telphone book and finds the Boo Brothers. Which are three ghosts. Shaggy, Scooby and Scrappy Doo can't leave because Shaggy's truck shunk . And they can't get soembody to get it out of the mud until the next morning.
Some scenes may scare little kids. Scrappy figures out the clues. The movie turns into Romeo and Juliet. The next door girl is in love with Shaggy while her brother Billy Bob and other memembers hate Shaggy. So there was a family feud going on between Shaggy's uncle's family and the next door neighbors. So how will Shaggy will stand all this, a next door girl, her brother, ghosts and a series of clues?