The next time the boys return to Dino World everything is different. They've been transported to the Jurassic period, which means they'll have all new dinosaurs to meet. Their exploration is cut short when a sudden downpour separates a stegosaurus egg from its motherand plops it into the boys' laps. When the steg egg starts to hatch, Jamie and Tom know they're on the clock to get the baby dino back to its mother. If only they could find her!