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!
Dennis Moore | Craig Foster | |
Roy Barcroft | The Purple Monster | |
Linda Stirling | Sheila Layton | |
James Craven | Dr. Cyrus Layton | |
Bud Geary | Hodge Garrett | |
Mary Moore | Marcia |
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