Flash Gordon: Purple Death From Outer Space (1966)
Feature-Length edit of the 1940 serial "FLASH GORDON CONQUERS THE UNIVERSE. Emperor Ming returns, targeting Earth with a mysterious substance that causes death, leaving the victims purple (though you wouldn't know it, since this is in B&W). Flash Gordon, Dr. Zarkov and Dale Arden are back to save the day.
Footage from the final half of the serial was used to complete another 1966 feature film PERIL FROM THE PLANET MONGO.
This film is public domain.
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RiffTrax Presents with Matthew J. Elliott and Ian Potter.