A few years after a falling out and subsequent break up the members of Mystery Inc are together again! Fred (Freddie Prinze Jr.), Daphne (Sarah Michelle Gellar), Velma, Shaggy (Matthew Lillard), and of course Scooby Doo are all invited to Spooky Island separately by Mr. Emile Mondavarious (Rowan Atkinson) to investigate a “Spooky” problem affecting the guests of the island amusement park. It seems that guests are markedly different when they leave the island, what is changing them and why? Reluctantly the team of wacky detectives is forced back together in order to pull the mask from this mystery!