Navy Commander Hal Roberts (Jock Mahoney) is assigned to lead an expedition to Little America in Antarctica to investigate reports of a mysterious warm water inland lake discovered a decade earlier. His helicopter and its small party, including beautiful reporter Maggie Hathaway (Shirley Patterson), is forced down into a volcanic crater by a fierce storm. They find themselves trapped in a lush tropical environment that has survived from the Mesozoic Era. Fighting carnivorous plants, dinosaurs, and a limited time window, they struggle to survive and repair the helicopter, their only means of escape. They are both helped and hindered by Dr. Carl Hunter (Henry Brandon), a megalomaniac survivor of an earlier expedition, who has learned to adapt to the hostile environment.
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