40 Best Science Fiction TV Shows of All Time

From superhero shows and space operas to creepy anthology series, the greatest small-screen sci-fi of all time

29. 'Agents of S.H.I.E.L.D.' (2013-Present)

While only sticklers tend to append the possessive sobriquet "Marvel's" to this show's title, it's absolutely worth noting: After all, S.H.I.E.L.D.'s mission is to dance between the raindrops of the Marvel Cinematic Universe's constant stream of big-screen blockbusters, reflecting changes to the status quo while still telling an engaging story about a team of super-spies in its own right. Ambitious action set pieces and likable performances from series leads Clark Gregg and Chloe Bennett ensure that it succeeds. STC

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