The Yowie Yahoo starts kidnapping musicians at a concert attended by Scooby and the gang in Vampire Rock, Australia.

A friend of Fred's, Alejo Otero, invites the Scooby gang to Veracruz, Mexico. There they find a monster, El Chupacabra, terrorizing the town.

When the Mystery Inc. gang is invited to Spooky Island, a popular amusement park, they soon discover that the attractions aren't the only things that are spooky. Strange things are happening, and ...