Tired of never finding real monsters, Scooby-Doo and his pals have gone their separate ways. Velma now owns a mystery bookshop; Scooby and Shaggy are customs inspectors at the airport; and Fred is producing Daphne's television show. But when the show does a segment on real monsters, the gang fires up the Mystery Machine and heads to Moonscar Island, where mysteries -- and more than a few zombies -- await!