Recent storms off the east coast of the United States stirred up some awesome prehistoric relics. After a six-inch tooth from a prehistoric Megalodon is discovered on a beach nearby, Greg and Luke take a walk along their beach. When Greg finds a shark’s tooth, he tells Luke about the ancient jewelry of primitive times made from bits of bone, animal teeth, shells, and gleaming rocks. In Luke’s dream, he accompanies Greg to Pangaea, the supercontinent that existed before breaking apart to form seven different continents. They meet a prehistoric princess and her dinosaur friends, and help them in their quest to save animals from a savage villain caveman. Greg and Luke discover the origin of a magical primitive artifact. Luke awakens to a surprise ending.