On a sunny island in the Pacific, the Mystery Inc. gang arrives to enjoy a well-deserved vacation. However, their plans for relaxation are interrupted when a mysterious sea creature starts terrorizing the locals and tourists. The legend of the "Lake of Death" resurfaces, along with an ancient myth of a monster that emerges from the water to spread panic.
The story becomes even more complicated when the friends encounter a local surfer who claims that the monster is behind a major surfing competition being held on the island. Determined to solve the mystery and save the event, Scooby-Doo and his friends dive into the investigation. Freddie, Daphne, Velma, Shaggy, and the unmistakable Scooby-Doo meet an appealing cast of island characters and fun obstacles along their way.
As the competition approaches, the tension rises, and the monster's appearances become more frequent. With all eyes on the contest and some epic surfing face-offs, the gang must use their clever mystery-solving techniques to unmask the culprit and uncover the truth behind the lake’s legend. From comedic situations to unexpected twists, this tropical adventure is filled with friendship, bravery, and of course, a whole lot of spooky surprises.