The Land Unknown

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.

• Virgil W. VogelDirector
• László GörögScreenplay
• Henry ManciniOriginal Music Composer
• Herman SteinOriginal Music Composer
• Heinz RoemheldOriginal Music Composer
• Hans J. SalterOriginal Music Composer

• Jock MahoneyCommander Harold 'Alan' Roberts
• Shirley PattersonMargaret 'Maggie' Hathaway
• William ReynoldsLt. Jack Carmen
• Henry BrandonDr. Carl Hunter
• Douglas KennedyCapt. Burnham
• Phil HarveyMachinist's Mate Steve Miller
• Kenner G. KempOfficer at Briefing / Officer on Ship (uncredited)
• Bing RussellRadio Operator (uncredited)
• Bert StevensOfficer at Briefing (uncredited)
• Tom ColemanMan at Briefing (uncredited)