Velma’s archaeologist uncle invites Mystery Inc. to his excavation in Mexico, where something has frightened the workers. By the time the gang arrives, the site is deserted and their host has vanished. Choose which characters to follow as Scooby-Doo and his friends investigate the empty dig and confront what appear to be ancient ghosts and monsters. Finding Velma’s uncle means deciding which clues to trust and how to look beyond the terrifying things guarding the mystery.