E
Edward Connell
David Fielding
B
Barbara Hewitt
Susan Turner
J
Jack Woods
Asmodeus
Frank Bonner
Jim Hudson
R
Robin Christopher
Vicki
J
James Phillips
Reporter Sloan
F
Fritz Leiber Jr.
Dr. Arthur Watermann
P
Patrick Burke
Doctor Branson
S
Sharon Gray
Nurse
L
Louis Clayton
Old man in cave
N
Norvelle Brooks
I
Irving L. Lichtenstein
J
James Dwion
The Orderly
Forrest J. Ackerman
Doctor on Tape Recorder (voice) (uncredited)
J
Jack H. Harris
Detective Harrison (uncredited)
C
Chuck Niles
Reporter Sloan (voice) (uncredited)
J
Jim Duron
The Green Giant