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Alien horror movies refer to films that combine elements of science fiction and horror, typically featuring extraterrestrial beings as the central antagonists. These movies often involve themes of invasion, fear of the unknown, and survival against otherworldly threats. The aliens in these movies can vary in appearance and abilities, ranging from monstrous creatures to highly advanced beings with sinister intentions. Alien horror movies aim to evoke feelings of suspense, terror, and unease in viewers as they explore the terrifying possibilities of encountering alien life forms.