Documentary, Sea Monsters: A Prehistoric Adventure, National Geographic Film, br Sea Monsters: A Prehistoric Adventure (also called Sea Monsters) is a 2007 American IMAX 3D documentary film by National Geographic, about prehistoric marine reptiles. It alternates modern-day sequences about the work of scientists studying the animals with computer-animated scenes depicting the prehistoric past. br br Sea Monsters was well received by critics. The tie-in video game, however, was panned.