Dare to solve the mystery of the haunting within the Joust for Fun castle, a medieval-themed restaurant and family fun center that is located in a real Scottish castle. The princess of Joust for Fun has mysteriously disappeared. To make matters worse, there's a fire-breathing dragon roaming the castle grounds! Has the Black Knight—the ghost of the castle's original owner—returned with his pet dragon to claim his castle and all that lies within? Or is there someone else behind the Black Knight and his dragon—someone who wants to scare everyone away from Joust for Fun and ensure its utter failure? Join Scooby-Doo, Shaggy, Daphne, Fred, and Velma as they explore the castle, and help them solve the mystery of the Phantom of the Knight.