Even the most legendary sci-fi TV shows of all time have at least one bad episode. Whether it’s Captain Kirk boldly leading the Enterprise, Rod Serling spinning eerie morality tales in The Twilight Zone , or the ragtag crew of Firefly quipping their way through space adventures, the most beloved sci-fi series inevitably stumble with a misfire or two along the way.

Consistency has never been the strongest quality of even the best sci-fi shows , which often swing between greatness and filler. That’s what makes the rare series that never dips in quality stand out so sharply. Whether a compact miniseries or a sprawling multi-season epic, a sci-fi show that maintains a flawless run from start to finish instantly earns its place in the upper echelon of the genre.

For fans of sci-fi,

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