Madelyn takes Shaggy on a tour of the school, explaining that the gryphon originally protected the castle the academy is based in before they are attacked by the beast.

Amidst this, they learn of ice cream mogul Calvin Curdles' repeated attempts to buy the castle and suspect him of being behind the attacks.

Velma and Daphne Blake soon find a secret passage leading to the school's attic, where they learn Rumblebuns used to date Curdles.

Meanwhile, Madelyn finds a book on Lord O'Flannery, the castle's original owner who wielded a staff said to be able to control the gryphon and was laid to rest on a nearby island that is said to be haunted by a banshee.

Nonetheless, Shaggy uses the staff to locate the gryphon's roost and rescue Madelyn before throwing it at the beast, causing it to lose control and eventually crash, revealing it was actually a puppet operated by Marlon via a blimp hidden by a fog machine.

After discovering O'Flannery used hidden mechanical devices to make outsiders believe the castle was protected by a gryphon, Marlon restored them and created the banshee illusion to scare off trespassers.

Having grown tired of Whirlen taking credit for his work, Marlon sought to use the devices to go solo, but was forced to use them to facilitate Curdles' plot to make the necessary capital.