#5. Alien (1979)

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– Director: Ridley Scott

– Stacker score: 95.6

– Metascore: 89

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– IMDb user rating: 8.4

– Runtime: 117 minutes

Before battling scores of aliens in the 1986 sequel, Ripley took on just one in this 1979 original. It all starts when the crew of spaceship Nostromo picks up a deadly lifeform, which proceeds to wreak total havoc in the vein of an acid-spitting serial killer. A milestone in the horror sci-fi genre, the film features a stomach-churning historic scene.