A Martian invader crashes his spaceship conveniently close to the workshop of a scientist who is developing an interplanetary craft. If the extraterrestrial Purple Monster can complete the rocket ship and return to Mars, he will be able to start a full-scale invasion of Earth. Good thing Craig Foster sets out to thwart the Monster's mission!
Roy Barcroft
The Purple Monster
Dennis Moore
Craig Foster
Linda Stirling
Sheila Layton
James Craven
Dr. Cyrus Layton
Bud Geary
Hodge Garrett
Mary Moore
Marcia
John Davidson
Emperor of Mars
Joe Whitehead
Carl Stewart
