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.
as Commander Harold 'Alan' Roberts
as Margaret 'Maggie' Hathaway
as Lt. Jack Carmen
as Dr. Carl Hunter
as Capt. Burnham
as Machinist's Mate Steve Miller
as Officer at Briefing / Officer on Ship (uncredited)
as Radio Operator (uncredited)
as Officer at Briefing (uncredited)
as Man at Briefing (uncredited)
