Figuring this out, Scooby, Scrappy, Shaggy and Matches (who managed to catch up with them) head toward 'Castle Revolta.' Scrappy tries to convince the Cadets to join them, but they refuse believing that the girls stole the volleyball match. Revolta and the Grim Creeper capture the girls and Revolta makes a potion that will turn them evil forever at the stroke of midnight. Meanwhile, Revolta's spider bats slowly capture the girls one by one. On a hike the Cadets are stuck in quicksand but are saved by Elsa and Tanis.

That same day, the Calloway Cadets are at the bog. Matches wants to come with them but is told to stay. She starts by hypnotizing Shaggy into taking the girls on a field trip to the Barren Bog. The power-hungry witch, Revolta, the self-styled Witch of the Web, and her minion the Grim Creeper plan to kidnap the girls and make them her slaves. As they leave due to various reasons, they warn a fearful Shaggy and Scooby not to let any harm come to their daughters or they'll be in big trouble. The girls' fathers come for Open House on Halloween night. The boys rig the volleyball with a remote control, but because of an accidental squirt of ketchup, the boys lose the remote, Scooby accidentally swallows the remote and it allows the girls to win instead. Gym class soon starts, to train the girls for their upcoming volleyball match against the boys of the neighboring Calloway Military Academy. The following morning begins with the class and the new teachers taking ballet lessons. Frightened by this, Shaggy and Scooby are initially hesitant, but eventually they agree to stay as gym teachers.

Other residents of the school are a floating white hand an octopus who is the school's butler Two sharks that live in the schools moat Legs, a spider that helps with the upcoming volleyball match Miss Grimwood, the headmistress and her diminutive pet dragon Matches. The pupils include Sibella, the daughter of Count Dracula Elsa Frankenteen, the daughter of a Frankenstein's monster-like monster Winnie, daughter of the Wolfman Phantasma (usually called Phanty for short), the ghostly daughter of a phantom and Tanis ( Tanis), the daughter of the Mummy – all parodies/tributes to the Universal Monsters of the 1930s–40s. Once there however, they find that it is actually a school for girl ghouls. Scooby-Doo, Shaggy, and Scrappy-Doo are on their way to Miss Grimwood's Finishing School for Girls, where they have been hired as gym teachers. Scooby-Doo and the Ghoul School is a 1988 animated made-for-television film produced by Hanna-Barbera for syndication as part of the Hanna-Barbera Superstars 10 series.

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