George Nader
Glenn Martin
Barbara Nichols
Gale Wilson
George Macready
Prof. Vaughn Dornheimer
Dolores Faith
Lisa Dornheimer
Hugh Beaumont
Austin Welles
Richard Arlen
National Intelligence
Richard Kiel
Dr. Kolos
J
John Indrisano
Thor, the Butler
T
Ted Durant
The Galaxy Being
T
Tommy Leonetti
Reporter (uncredited)
W
Walter Maslow
L
Larry Barton
L
Lori Lyons
B
Benito Prezia
M
Margaret Teele
Blonde Lab Assistant
Alean 'Bambi' Hamilton
Brunette Lab Assistant
Walter Abel
Dr. Munson
Lon Satton
M
Mel Ruick
Dr. Munson (as Melville Ruick)
K
Kim Satana
Dr. Lin Yung
J
John Dasten
(as John Daston)
R
Richard Schuyler
W
William White
(as Bill Hampton)
Lon Satton
Reporter (uncredited)
A
Andrew Johnson
(Uncredited)