Journey 80 million years back in time to an age when ferocious prehistoric creatures swarm, hunt, and fight for survival beneath the vast, mysterious seas. Stunning, realistic imagery recreates the perilous underwater realm of two young, dolphin-sized marine reptiles called Dolichorhynchops, and their journey among the most awesome predators ever to prowl the oceans. Interweaving ground-breaking fossil finds with cutting-edge computer-generated animation, National Geographic's powerful storytelling immerses you in the age when monsters ruled the seas! Narrated by Liev Schreiber. Available in 2D and 3D.