Mayoral candidate Jesper Poubelle, an anti-vampire agitator, is also stirring up trouble by protesting the festival.
The troupe leader Bram, who catches the eye of Daphne, announces the group will perform a vampire resurrection ritual.
They check out the trailer of his organization and discover he plans to run for Mayor, and is using the vampire story to increase his notoriety.
There they meet Tulie, who reveals he invented a pair of hover shoes, but the plans were stolen by vampires, and he was forced to flee into the swamp.
Van Helsing, however, says the clothing has been changed over the years due to the disintegration of the original material, but the body is still the actual vampire.
The monster appears to claim his bride, and with a swirl of green mist he sends the actors to sleep, telling them that when they awake they will be immortal.
In the ensuing chase, Valdronya's costume is blown away by Scooby and Shaggy's airboat's propeller, revealing modern clothes and Tulie's hover boots underneath, and the vampire is then captured by Fred.
He used stolen boots, knockout gas, a machine in the swamp and holographic projections to create the monster effects.