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