Hearing a noise from outside the airplane, he lifts the shade of his window, revealing a gremlin monster outside on the wing, damaging it with his claws.

While the passengers watch in terror, Shaggy, Scooby-Doo, Fred, Daphne and Velma managed to capture the monster with a parachute.

Dropping off the monster for the police, the gang unmask him revealing himself to disgruntled passenger, Herman Ellinger who had a grudge against airlines.

But before the competition can start, Morgan le Fay arrives and paralyzes Fred, leaving him unable to compete, forcing Daphne to take his place while Velma becomes apprentice to the wizard Merlin to work out a way to go back to their time.

The gang and Arthur follow them to Morgan le Fay's lair and discover that Shaggy has been tricked into signing his right to the throne in exchange for a banquest.

When the townfolk feared Shaggy might claim their town as his birthright, they used a Camelot experience attraction with actors, special effects to make the gang believe they travelled back in time and to get Shaggy to sign over the deed to the town, and King Arthur reveals himself as Winston Pilkingstonshire, an actor who previously portrayed Thundarr.