Alien (1979)

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After a space merchant vessel perceives an unknown transmission as distress call, its landing on the source moon finds one of the crew attacked by a mysterious life-form, and they soon realize that its life cycle has merely begun. (IMDb)
Only a few instances of distractingly dated SFX (see the puppet-like movement of the worm; big explosion) mar this claustrophobic and intimate sci-fi thriller: Natural dialogue and pacing, along with an excellent use of long tracking shots, shaky handheld movement, and facial close-ups capture perfectly the unsettling dread, shocking horror, and relatable characters trying to cope in a uniquely nightmarish plot (the initial terror from the gross alien is boosted by the robot twist later on).
8.5/10 (Amazing)