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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.

Director : Ford Beebe, Ray Taylor

Writer : George H. Plympton, Barry Shipman, Basil Dickey

Cast

Buster Crabbe

Carol Hughes

Charles Middleton

Anne Gwynne

Frank Shannon

John Hamilton