Over the course of the last quarter of a century, science fiction fans have been treated to TV shows that have proven beyond a shadow of a doubt that sci-fi television is alive and well in the 21st century. Whether these shows are family-friendly or fully for adults, whether they're cartoons or live-action gems, and whether they revolutionized the genre or simply added a new masterful entry to its canon, they're all essential viewing for sci-fi fans.
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