Adventure-seeker Ted Osborne (Phillip Reed) has convinced his fiancé Carole (Virginia Grey) to finance his expedition to an uncharted South Pacific island supposedly populated with dinosaurs. Piloting their ship is Captain Tarnowski (Barton MacLane), a ruthless alcoholic suffering from malaria-induced bouts of insanity. When they arrive at the island, they discover that the stories they have heard are all true. Also stars Richard Denning. Ray “Crash” Corrigan appears as a monster.