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Sometimes you just want to escape your real life and get lost in the mind-bending worlds of science fiction. But what are the best sci-fi TV shows, according to critics?
We looked at critical consensus on the review-aggregation website Rotten Tomatoes to find out which sci-fi series journalists deem essential.
The results include a range of titles, from classic television like "The Prisoner" and "Mork & Mindy" to more recent hits such as "Stranger Things" and "Watchmen."
Here are the 27 best sci-fi TV shows of all time, according to critics.