Brian loves dinosaurs. When he discovers that frogs were around when dinosaurs were alive, he decides that makes him a dinosaur - a Brianosaurus, in fact. At first, it's fun. But his woodland friends think he should roar all the time, not use trampolines or read books. And the frogs think he's making the pond look bad. So Brianosaurus decides to act exactly the way they want. The trouble is, he isn't happy - until he decides to be himself.