Navy Commander Alan Roberts 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 reporter Maggie Hathaway, is forced down into a volcanic crater by a fierce storm. They find themselves trapped in a lush tropical environment that has survived from prehistoric times.

• Universal International Pictures
• Jock Mahoney
• Shirley Patterson
• William Reynolds
• Henry Brandon
• Douglas Kennedy
• Phil Harvey
• Kenner G. Kemp
• Bing Russell