Journey 80 million years back in time to an age when mighty dinosaurs dominated the land and an equally astonishing assortment of ferocious creatures swam, hunted, and fought for survival beneath the vast, mysterious prehistoric seas. Stunning, photo-realistic imagery re-creates the perilous underwater realm of two young, dolphin-sized marine reptiles called Dolichorhynchops, or Dollies, and follows their incredible journey through waters ruled by some of the most awesome predators ever to prowl the Earth's oceans. Interweaving ground-breaking fossil finds from around the globe with cutting-edge computer generated re-creations, National Geographic's powerful storytelling immerses you in the life or death drama of an age when monsters ruled the seas! Narrated by Liev Schreiber with original music from Peter Gabriel and The Footnote.