When Flinn first met the Pirate Dinosaurs, he thought that he had taught them a lesson. But the real lesson is this – never trust a pirate, but never ever trust a pirate dinosaur. This time, Flinn is hot on the trail of some stolen treasure and he knows exactly who's to blame. With the help of his friends and Captain Gurgleguts, fearless Flinn tracks the rotten crew to the Lost Island. So far, so good, but Flinn and his pals hadn't reckoned on the dinosaur's secret weapon – the Giganotosaurus, T-Rex's cousin and the biggest dino the world has ever known! Will our hero be able to sail out of trouble this time? And what about all that stolen treasure? Luckily, every baddie has a weak spot and it's not long before the swashbuckling Flinn fights his way to victory!