A mysterious plague, the Purple Death, ravages the earth. Dr. Zarkov, investigating in his spaceship, finds a ship from planet Mongo seeding the atmosphere with dust. Sure enough, Ming the Merciless is up to his old tricks. So it's back to Mongo for Flash, Dale, and Zarkov.
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Verdict: Unknown
> Ford Beebe (Director)
> Ray Taylor (Director)
> Jerome Ash (Director of Photography)
> William A. Sickner (Director of Photography)
> George H. Plympton (Screenplay)
> Basil Dickey (Screenplay)
> Barry Shipman (Screenplay)
> Alex Raymond (Characters)
