The Scooby-Doo Gang and the Martin family are visited by a Mr. John A. Hammond, who offers them to go to an island of living dinosaurs. The gang decide to go on ahead, since they've been worked to the ground with all the scares they've been given. However, their nightmares are far from over, as all the power in the entire park shuts down, and the most dangerous dinosaurs to ever exist escape. Not only do the gang have to survive the monsters, something else is lurking amongst the island, and it will stop at nothing till it hunts down the last living being on the island.