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