A military rocket goes missing somewhere over the Pacific. A team of scientists and soldiers hike into a fog-choked plateau and find something that should not exist — dinosaurs, prehistoric rock formations, and a jungle that time forgot. Shot cheap, dreamed big. This is pulp science fiction at its most earnest: rubber monsters, stock footage glory, and enough jungle atmosphere to make you sweat. The Cold War anxiety is baked right in. Nobody flinches. Everyone dies confused.