Bradley Birzer explains how C. S. Lewis and Ray Bradbury elevated the most imaginative of genres.

One only has to imagine possibilities to be in the realm of science fiction. Imagine a species in which there are six genders. Imagine blowing up the sun. Imagine a planet where a duke becomes a messiah, a god, a conqueror of the universe, and then a blind prophet. Imagine fascism arising in America. Imagine totalitarianism being so pervasive that the leader is called Big Brother. Imagine black people solving the racial problem by a mass exodus from this racist planet. Imagine a world in which everyone lives in paradise until being executed at the age of thirty. Imagine a place in which genetics have gone so far as to create supermen and superwomen. Imagine a wagon train to the stars. Imagine . . .

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