
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.
Cast

Jock Mahoney
Commander Harold 'Alan' Roberts

Shirley Patterson
Margaret 'Maggie' Hathaway

William Reynolds
Lt. Jack Carmen

Henry Brandon
Dr. Carl Hunter

Douglas Kennedy
Capt. Burnham

Phil Harvey
Machinist's Mate Steve Miller

Kenner G. Kemp
Officer at Briefing / Officer on Ship (uncredited)

Bing Russell
Radio Operator (uncredited)

Bert Stevens
Officer at Briefing (uncredited)
Tom Coleman
Man at Briefing (uncredited)
Crew

Virgil W. Vogel
Director
William N. Robson
Adaptation
László Görög
Screenplay
Charles Palmer
Story
Fred MacDowell
Editor
Ellis W. Carter
Director of Photography
Joseph E. Kenney
Assistant Director

William Alland
Producer
Lloyd Ward
Camera Operator
Lew Swartz
Assistant Camera
Nevada Penn
Wardrobe Master

Bud Westmore
Makeup Artist
Jack Kevan
Special Effects
Orien Ernest
Special Effects
Fred Knoth
Special Effects
Roswell A. Hoffmann
Visual Effects
Hans J. Salter
Original Music Composer

Henry Mancini
Original Music Composer
Herman Stein
Original Music Composer
Heinz Roemheld
Original Music Composer
Ray Jeffers
Set Decoration
Russell A. Gausman
Set Decoration
Richard H. Riedel
Art Direction
Alexander Golitzen
Art Direction
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