The discovery of an unusual fossil sets off a fascinating paleontological investigation. Drawing on research done all over the world, scientists reconstruct the extraordinary and menacing world of the oceans of the Cretaceous period and of its gigantic inhabitants. Follow "Dolly," one of the reptilian monsters of the deep, as she goes through her routine as recreated in 3D for the giant screen. A National Geographic Films production with an original musical score by Peter Gabriel.