Synopsis
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)

Frank Wilcox
Alfred Cassidy
Sydney Mason
Frank the garage man

Larry J. Blake
Motorcycle cop
Bert Stevens
Air Intelligence Command Officer

Forbes Murray
Military Officer at Experiment

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)

Paul Frees
Alien (voice) (uncredited)
James Gonzalez
Military Official (uncredited)
Duke Green
Minor Role (uncredited)
Ed Haskett
Military Official (uncredited)
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