When Mikey and Robbie Davis find a time portal in the Green Woods they gather their friends and are transported to a time when dinosaurs roamed the earth.

When Jamie moves to Dinosaur Cove with his father he's looking forward to doing some fossil hunting on the beach. But when he and his friend, Tom, discover a forgotten cave with fossilised dinosaur footprints, it takes them to another world ...a world of dinosaurs. In this secret place the boys meet a small, friendly Wannanosaurus, who leads them further into the prehistoric landscape, past mysterious fungi and strange fruits (which smell like sick!)....