The kids do the right thing and give the pirate dinosaurs swimming lessons. But the ‘baddest baddies’ return the favour by doing the wrong thing. They are too scared to go in the water and run away into a cave. There they find some treasure, steal it, trap the kids in the cave and sail away on the Acorn. But good wins over greed and Flinn and his crew emerge victorious. Because of his greedy ways, T-Rex doesn’t learn to swim, and has to be rescued when he falls overboard.