The following article contains spoilers.Over the course of the past decade, modern times' greatest sci-fi shows have gifted us some of the best series finales that the genre has ever seen. When a sci-fi show comes to an end, no matter how long it ran for, it's a big event, and fans expect it to come to a fittingly satisfying close. Whether that close is exciting, mind-bending, emotionally devastating, or all of those things—and more—at once, it has to be something that'll make fans happy with how their favorite series ended.
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