The comic strip follows the adventures of Flash Gordon, a handsome polo player and Yale graduate, and his companions Dale Arden and Dr. Hans Zarkov. The story begins with Earth bombarded by fiery meteors. Dr. Zarkov believes the meteors are from outer space, and invents a rocket ship to locate their place of origin. Half mad, he kidnaps Flash and Dale, and the three travel to the planet Mongo, where they discover that the meteors are weapons devised by Ming the Merciless, evil ruler of Mongo.
circa 1930
credit: Wikipedia
This is the original origin and there have been about 3 or 4 different variations of it....