"A giant prehistoric praying mantis, recently freed from the Arctic ice, voraciously preys on American military at the DEW Line and works its way south."
Craig Stevens
as Col. Joe Parkman
William Hopper
as Dr. Nedrick 'Ned' Jackson
Alix Talton
as Marge Blaine
Donald Randolph
as Gen. Mark Ford
Florenz Ames
as Prof. Anton Gunther
Paul Smith
as Corporal
Paul Campbell
as Lt. Fred Pizar
Pat Conway
as Sgt. Pete Allen
Phil Harvey
as Lou
Helen Jay
as Mrs. Farley
Bing Russell
as State Trooper
David McMahon
as Capt. Frank Carver
Marvin Miller
as Narrator (voice)
Michael Forest
as Photographer (uncredited)
Sumner Williams
as C-47 Pilot (uncredited)
Chester W. Schaeffer
Editor
Nathan Juran
Director
William Alland
Story
Producer
Ellis W. Carter
Director of Photography
Martin Berkeley
Screenplay
Irving Gertz
Original Music Composer
Robert Clatworthy
Art Direction
Clifford Stine
Visual Effects
Alexander Golitzen
William Lava
Jay A. Morley Jr.
Costume Design
Bud Westmore
Makeup Artist
William Holland
Assistant Director
Russell A. Gausman
Set Decoration
Oliver Emert