It's remarkably difficult to make a sci-fi show that's truly and entirely flawless. After all, when you make a story meant to span the course of several seasons and dozens (or even hundreds) of episodes, there's bound to be a dud here or there. There are some exceptional sci-fi series , however, that can brag about not having a single episode that could be considered bad .

From classics to modern gems and from animation to live-action, these are some of the best sci-fi shows ever made, as proved by the fact that all of their episodes are, at the very least, good . When even your weakest episode has a ton of things to offer, you know you've got a terrific show on your hands. These series are ranked according to the quality of their worst episode.

1 'Cowboy Bebop' (1998–1999)

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