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