Flash Gordon Conquers the Universe is a 1940 twelve episode serial film about Flash Gordon. It was the last of three Flash Gordon serials made from 1936 to 1940.   The film starts on Earth. A deadly plague has been ravaging the planet, known as the Purple Death because it leaves a purple spot on the forehead of its victims. Ming the Merciless is suspected to be behind the plague, and Flash Gordon is sent with Dr. Zarkov and Dale Arden to the planet Mongo to find the cause of the plague, as well as a cure. Caused by Ming’s spaceships dropping “Death Dust” into the Earth’s atmosphere, they eventually find an antidote for it and Flash and Zarkov distribute it by the same method soon after the start of the series, while Dale Arden remains in the forest kingdom.

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