Shaggy, Scooby-Doo and the Mystery Inc. gang head for Hawaii and the Big Kahuna of Hanahuna Surfing Contest, but strange happenings and an island curse cast a shadow over the competition.
On the way to Daphne's relatives' condominium, the Mystery Inc. gang detours through the town of Winter Hollow, where the vengeful Headless Snowman has destroyed the town's Christmas spirit.