Director
Spencer Gordon Bennet
DIRECTOR
Fred C. Brannon
Writer
Royal K. Cole
WRITER
Albert DeMond
Basil Dickey
Joseph F. Poland
Barney A. Sarecky
Stars (in credits order)
Dennis Moore
Craig Foster
Linda Stirling
Sheila Layton
Roy Barcroft
The Purple Monster
James Craven
Dr. Cyrus Layton
Bud Geary
Hodge Garrett
Mary Maynard
Marcia
John Davidson
Emperor of Mars
Joe Whitehead
Carl Stewart
Emmett Vogan
Saunders
George M. Carleton
Dr. Paul Meredith
Kenne Duncan
Charles Mitchell
Rosemonde James
Helen
Monte Hale
Dr. Harvey
Wheaton Chambers
Prof. Benjamin
Anthony Warde
Tony
Ken Terrell
Andy Martin
Robert Blair
Police Inspector Evans (uncredited)
Lane Chandler
Radio Room Technician (uncredited)
George Chesebro
Shaw (uncredited)
John Daheim
Barnes (uncredited)
Fred Graham
Baker (uncredited)
Carey Loftin
Mack (uncredited)
Cliff Lyons
Clay (uncredited)
Lou Marcelle
Narrator (uncredited) (voice)
Tom Steele
Lab Thug (uncredited)
Dale Van Sickel
Cop (uncredited)
Robert J. Wilke
Dr. Harvey's Assistant (uncredited)
Henry Wills
Osborne (uncredited)
