A Mexican vacation becomes a search for missing Aztec treasure for Scooby-Doo and the gang. The town of Cinco, supposed site of a gala fiesta, is deserted, what with its residents terrorized by a stone monster and the ghost of The Aztec God Of Contezuma. Searching for an ancient pyramid nearby, the gang find clues that lead them to a mysterious river barge and a cave where the treasure is being smuggled away. Ghost and monster lose their disguises in the ensuing pursuit, only to be revealed as Professor Stonehack and his wife, archaeologists who were stealing the Aztec treasure for themselves. With law and order restored to Cinco, the fiesta begins and Shaggy and Scooby build a giant burrito for themselves.
