Plot: Flash Gordon is an American football player who along with Dale Arden are returning to New York City after a long vacation, until the plane they are passengers on crashes into the laboratory of Russian scientist Dr. Hans Zarkov. Both Flash and Dale become unwilling passengers on-board Zarkov's rocketship as Zarkov sets a course for the planet Mongo. Arriving on Mongo, Flash and his companions find the planet is under the rulership of the evil Emperor Ming the Merciless and Ming is attacking Earth with natural disasters as he bids to destroy Earth. Realizing that Earth and the human race is in mortal danger, Flash decides to unite the kingdoms of Mongo and combine the forces of rivals Prince Barin and Prince Vultan to rescue Dale, who is to become Ming's wife and defeat Ming and save Earth from annihilation.
Alternative Plot: Although NASA scientists are claiming the unexpected eclipse and strange "hot hail" are nothing to worry about, Dr. Hans Zarkov (Topol) knows better, and takes football star Flash Gordon (Sam Jones) and travel agent Dale Arden (Melody Anderson) with him into space to rectify things. They land on planet Mongo, where the despot Ming the Merciless (Max von Sydow) is attacking Earth out of pure boredom. With the help of a race of Hawkmen, Flash and the gang struggle to save their home planet.
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