The best alien movies of all time challenge audience expectations about extraterrestrial life. These are the movies where the aliens' role and creature design prompts introspective thoughts or makes compelling comments about crucial moments in human history. Whether the story focuses on horror, drama, or sci-fi elements, the greatest alien movies also provide insights into humanity's evolution and technological advancements.

From friendly alien movies to ones where the extraterrestrials are horrific villains, these films make their home on the fringes of science, which is part of what makes them so memorable. Some of the best alien movies of all time are also celebrated for their cinematic achievements relative to the era they were produced.

Indeed, while modern and cutting-edge CGI

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