Trailer
Cast
Charles Evans
Dr. Alberts (uncredited)
Harry Lauter
Cutting - Generator Technician (uncredited)
Mike Ragan
Tank Commander (uncredited)
Sol Murgi
Plane Passenger (uncredited)
William Woodson
Narrator (voice) (uncredited)
Forbes Murray
Military Officer at Experiment, Military Officer at Experiment (uncredited)
Frank Wilcox
Alfred Cassidy, Alfred Cassidy (uncredited)
Dale Van Sickel
Man Crushed Beneath Wall (uncredited)
Grandon Rhodes
Gen. Edmunds
Hugh Marlowe
Dr. Russell A. Marvin
Morris Ankrum
Brig. Gen. John Hanley
Clark Howat
Sgt. Nash (uncredited)
Arthur Tovey
Officer/Civilian at Military Conference
Joan Taylor
Carol Marvin
Thomas Browne Henry
Vice Adm. Enright
Paul Frees
Alien (voice), Alien (voice) (uncredited)
Larry J. Blake
Motorcycle cop
Donald Curtis
Maj. Huglin
John Zaremba
Prof. Kanter