The Top 40 Sci-Fi Movies of the 21st Century

From space-invader thrillers to interstellar-overdrive headscratchers, we're counting down the best science fiction films since the turn of the century

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'The Host' (2006)
Magnolia Pictures/Courtesy Everett Collection20/40

20. 'The Host' (2006)

Giant-monster flicks have always been about ecological destruction, and this one is no different. Using a 2000 incident of formaldehyde dumping in Seoul as inspiration, this South Korean tale of a creature emerging from the Han River – who not only attacks people, but infects them with a virus – broke box office records in its native country and set a new standard for nature-run-amok parables. It's equal parts politically sharp, brutally hilarious, incredibly suspenseful – and totally icky. CGW

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