Everybody loves amusement parks, unless they're haunted. In Scooby's Fun Zone, Scooby-Doo, Shaggy, and Scrappy-Doo pit their wits against a muscle-bound strongman. The crew attends a carnival at their Central High alma mater and loses their science teacher, Mr. McDrabble. Finally, the gang visits a state fair and dreams of returning to the present when they lose Daphne in an automated house of the future in High-Tech House of Horrors.

Scooby-Doo, Shaggy, Daphne, Fred and Velma are off on more outlandish adventures as the super-sleuths race to outwit everything from creepy clowns, to aliens, to an evil entity determined to destroy the world! The darkest secrets of their hometown of Crystal Cove, the "Most Hauntedest Place on Earth" are about to come to light, but will finally solving this mystery mean the end for Scooby-Doo and the Gang?