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Cast (11)
Roy Barcroft
as The Purple Monster
James Craven
as Dr. Cygnus Layton
Dennis Moore
as Craig Foster
Linda Stirling
as Sheila Layton
Bud Geary
as Hodge Garrett
J.W
Joe Whitehead
as Stewart
F.H
Fred Howard
as Prof. Crandal
R.J
Rosemonde James
as Helen
M.M
Mary Moore
as Marcia
John Davidson
as Emperor of Mars
Wheaton Chambers
as Prof. Benjamin
