During World War I, a German U-boat sinks a British passenger ship and takes the survivors aboard. After getting lost in fog, the submarine surfaces near the unknown island of Caprona, a lost world where they find dinosaurs and Neanderthals.

Cast:Doug McClure, John McEnery, Susan Penhaligon, Keith Barron, Anthony Ainley, Godfrey James,

Genre:Science Fiction, Action, Adventure,

country:United Kingdom, United States of America,

Production:Land Associates, Amicus Productions, Edgar Rice Burroughs Inc., British Lion Films, American International Pictures,