– Director: Philip Kaufman

– Stacker score: 83.2

– Metascore: 75

– IMDb user rating: 7.4

– Runtime: 115 minutes

The fact that the oldest film on this list also makes the top ten is notable; many of the deep questions posed by old sci-fi movies seem dated to us (are “Star Trek’s” communicators any better than an iPhone?). However, the fear of someone you love seeming just a little off still raises goosebumps on the flesh of any viewer. The culprit: alien pods that, when they reach maturity, duplicate humans entirely, though the duplicates are devoid of any emotion.

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