While heading toward summer jobs at a country club owned by Daphne's uncle, the Mystery Inc. gang stumbles onto strange happenings around the local lake - including mystical moonstones, creepy characters and a Frog Monster on the loose. There's mystery afoot and romance in the air that only the fearful foursome-plus-one - Fred, Daphne, Velma, Shaggy and Scooby-Doo - can solve in Scooby-Doo: Curse of the Lake Monster!