Test space rockets exploding at liftoff and increased reporting of UFO sightings culminate in a direct attempt by alien survivors of a dead, extra-galactic civilization to invade Earth from impervious flying saucers, using ray-weapons of mass destruction.
Cast
Hugh Marlowe
Dr. Russell A. Marvin
Joan Taylor
Carol Marvin
Donald Curtis
Maj. Huglin
Morris Ankrum
Brig. Gen. John Hanley
Thomas Browne Henry
Vice Adm. Enright
Grandon Rhodes
Gen. Edmunds
John Zaremba
Prof. Kanter
Paul Frees
Alien (voice), Alien (voice) (uncredited)
Frank Wilcox
Alfred Cassidy, Alfred Cassidy (uncredited)
Sydney Mason
Frank the garage man
Larry J. Blake
Motorcycle cop
Bert Stevens
Air Intelligence Command Officer
Forbes Murray
Military Officer at Experiment, Military Officer at Experiment (uncredited)
Arthur Tovey
Officer/Civilian at Military Conference
Alan Wells
Major Kimberly
Nicky Blair
Military Officer at Experiment (uncredited)
Jimmy Cross
Military Messenger (uncredited)
Jack Deery
Military Officer (uncredited)
Charles Evans
Dr. Alberts (uncredited)
Raoul Freeman
Military Official (uncredited)
James Gonzalez
Military Official (uncredited)
Duke Green
Minor Role (uncredited)
Ed Haskett
Military Official (uncredited)
Clark Howat
Sgt. Nash (uncredited)
Harry Lauter
Cutting - Generator Technician (uncredited)
Don Marlowe
Minor Role (uncredited)
William Meader
Worker in Control Tower (uncredited)
Sol Murgi
Plane Passenger (uncredited)
William J. O'Brien
Radio Listener (archive footage) (uncredited)
Murray Pollack
Plane Passenger (uncredited)
Mike Ragan
Tank Commander (uncredited)
Alan Reynolds
Maj. Kimberly (uncredited)
Dale Van Sickel
Man Crushed Beneath Wall (uncredited)
Guy Way
Civilian Observing Saucer Attack (uncredited)
Bob Whitney
Plane Passenger (uncredited)
Beal Wong
Chinese Radio Listener (uncredited)
William Woodson
Narrator (voice) (uncredited)
Crew
Fred F. Sears
Director
George Worthing Yates
Screenplay
Bernard Gordon
Screenplay
Curt Siodmak
Screenstory
Donald E. Keyhoe
Novel
Danny B. Landres
Editor
Fred Jackman Jr.
Director of Photography
Gene Anderson Jr.
Assistant Director
Jack Erickson
Production Coordinator
Sam Katzman
Executive Producer
Charles H. Schneer
Producer
J.S. Westmoreland
Sound
Russ Kelley
Special Effects
Ray Harryhausen
Visual Effects
Sidney Clifford
Set Decoration
Leon Chooluck
Unit Manager
Paul Palmentola
Art Direction
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