All of the Scooby Doo movies listed in order
Shaggy Rogers discovers that his uncle Colonel Beauregard has died and left him his country estate, which is on a plantation. After being chased away by a ghost witch, Shaggy, Scooby and Scrappy head for the estate in order to claim Shaggy's inheritance. Before they can get there, they meet Sheriff Rufus Buzby, who warns them about the whole estate being haunted and that they should leave. Before he can fully convince them, he receives a call from the police chief, notifying him that a circus train has derailed and a circus ape has escaped. Leaving Shaggy, Scooby and Scrappy, they continue driving, but upon their arrival they are pursued by a headless horseman, a ghost wolf and by the alleged ghost of the Colonel who taunts them, telling them to leave or else they will face the consequences.
Scooby, Shaggy and Scrappy are on their way to a Miss Grimwood's Finishing School for Girls, where they've been hired as gym teachers. Once there, however, they find that not only is it actually an all-girl school of famous monsters' daughters, but there's a villainess out to enslave the girls.