In the Atlantic of World War I, the crew of a German U-Boat rescue the survivors of the British supply ship they sunk...and the ensuing struggles for control of the sub leave them hopelessly off course. Ultimately, they're forced to put in at an uncharted isle...and find it populated by savage primitives, as well as still-thriving─and deadly─dinosaurs. Thrilling take on the Edgar Rice Burroughs adventure stars Doug McClure, Susan Penhaligon, John McEnery. 90 min. Widescreen; Soundtrack: English Dolby Digital mono; audio commentary; theatrical trailer.