Ruh-roh! Fred's cousin, Jed, is nowhere to be found! His animatronic monsters have gone haywire and are attacking everyone in sight. It's up to Scooby-Doo and Mystery, Inc. to stop the creepy costumed creatures, unmask the mystery and find Jed before its too late. Could Jed be a prime suspect? Zoinks! Get a Scooby-Snack!