Roy Barcroft
The Purple Monster
Acting
Dennis Moore
Craig Foster
Acting
Linda Stirling
Sheila Layton
Acting
James Craven
Dr. Cyrus Layton
Acting
Bud Geary
Hodge Garrett
Acting
Mary Moore
Marcia
Acting
John Davidson
Emperor of Mars
Acting
Joe Whitehead
Carl Stewart
Acting
Emmett Vogan
Saunders
Acting
George M. Carleton
Dr. Paul Meredith
Acting
Kenne Duncan
Charles Mitchell
Acting
Rosemonde James
Helen
Acting
Monte Hale
Dr. Harvey
Acting