The Purple Monster
Roy Barcroft
Dr. Cygnus Layton
James Craven
Prof. Benjamin
Wheaton Chambers
Craig Foster
Dennis Moore
Sheila Layton
Linda Stirling
Hodge Garrett
Bud Geary
Stewart
Joe Whitehead
Prof. Crandal
Fred Howard
Helen
Rosemonde James
Marcia
Mary Moore
Emperor of Mars
John Davidson
Director
Spencer Gordon Bennet
Fred C. Brannon
Screenplay
Royal K. Cole
Albert DeMond
Basil Dickey
Lynn Perkins
Joseph F. Poland
Barney A. Sarecky
Producer
Ronald Davidson
Director of Photography
Bud Thackery
Original Music Composer
Milton Rosen
Marlin Skiles
Music
Charles Maxwell
Sound
Ed Borschell