As the sequels (“Aliens,” “Alien 3,” “Alien Resurrection”) will make all too abundantly clear, the alien is capable of being just about any monster the story requires. Because it doesn’t play by any rules of appearance or behavior, it becomes an amorphous menace, haunting the ship with the specter of shape-shifting evil. Ash (Ian Holm), the science officer, calls it a “perfect organism. Its structural perfection is matched only by its hostility,” and admits: “I admire its purity, its sense of survival; unclouded by conscience, remorse, or delusions of morality.”

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