Cast
Roy Barcroft
The Purple Monster
James Craven
Dr. Cygnus Layton
Dennis Moore
Craig Foster
Linda Stirling
Sheila Layton
Bud Geary
Hodge Garrett
J
Joe Whitehead
Stewart
F
Fred Howard
Prof. Crandal
R
Rosemonde James
Helen
M
Mary Moore
Marcia
John Davidson
Emperor of Mars
Wheaton Chambers
Prof. Benjamin
