With Earth gripped by panic and terror from apocalyptic weather changes, Flash Gordon is ambushed by ace reporter Dale Arden concerning a mysterious secret mission before both are pursued by Nazi agents through the streets of New York all the way to the Andes Mountains of Peru.

Surviving a daring parachute escape, they reach the secret U.S. military base of Dr. Hans Zarkov only to learn of an unknown, greater peril that awaits. Zarkov's rocket carries them through a strange portal in space to the planet Mongo, where peril and death seem to await their every turn.

Ruled by the evil, despotic Ming the Merciless for over 800 years, Mongo is fueled by such blinding racial hatred that its various races live in a perpetual state of destructive warfare and conflict. As he meets amazing Lionmen, forest-dwelling Arborians, winged Hawkmen and amphibious Aquans among others, Flash must convince the various races that only through unity, co-existence and co-operation can Ming be defeated, while their stubborn, ancient prejudices will only serve to ensure their own continued misery and subjugation.

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