It should go without saying that a sci-fi show that's perfect is the dream of every fan of genre television. But a sci-fi show that's almost perfect—a near-masterpiece, if you will—can be every bit as delightful. There can be a variety of reasons why they don't quite reach "masterpiece" status. Perhaps they're a little dated, or they have a couple of narrative mistakes here and there, or they were prematurely cancelled before they could achieve greatness. But no matter what, these are still some of the greatest sci-fi shows ever made.
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