Science fiction has been around for a long time, and has been around since the earliest days of television with "The Twilight Zone" and the original "Star Trek" series. And it's not going away. In fact, it's only getting more popular.
With network shows like "The X-Files,""Lost," and Netflix's "Stranger Things" tackling the genre over the past few decades, sci-fi shows are reaching a broader audience than ever before. "Orphan Black" has found critical acclaim and premieres its final season June 10.
If you're new to sci-fi or a die-hard fan looking for more, here are the best sci-fi shows according to critics, based on scores from Metacritic, which aggregates reviews of TV shows:
Note: superhero shows based on comic books were left out, along with older shows that don't have Metacritic scores ("The Twlight Zone," the original "Star Trek," the original "Doctor Who").
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19. "Star Trek: The Next Generation" (1987-1994)
"Re-visiting Star Trek on television holds the same nostalgic, socko appeal that the boffo-box-office movies do. I didn't miss Kirk, Spock and friends." -Miami Herald
18. "Dollhouse," 2009-2010
17. "Quantum Leap" (1989-1993), five seasons
"A canny and clever series that makes hardware take a back seat to humanity." -USA Today
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