After a powerful storm, the brave pups find themselves stranded on a mysterious tropical island inhabited by real dinosaurs. There, they meet a resourceful dog named Rex and embark on an unforgettable adventure. But when their longtime rival, Mayor Humdinger, accidentally awakens a massive dormant volcano, the team must spring into action. Facing danger at every turn, the pups launch their biggest and most challenging rescue mission yet to save the island and its prehistoric inhabitants.