Flash Gordon Conquers the Universe 1940

Synopsis:

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.

Directed by: Ford Beebe & Ray Taylor
Written by: Basil Dickey & George H. Plympton & Barry Shipman
Runtime: 195 minutes
Critics score:
Tagline: New Thrills...New Marvels, New Wonders New Thrills!...New Marvels, New Wonders
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Cast:
Buster Crabbe
Buster Crabbe
Flash Gordon 
Carol Hughes
Carol Hughes
Dale Arden 
Charles Middleton
Charles Middleton
Emperor Ming 
Anne Gwynne
Anne Gwynne
Sonja 
Frank Shannon
Frank Shannon
Dr. Zarkov 
John Hamilton
John Hamilton
Professor Gordon