An alien is any living organism, including plants and animals, that does not originate from the planet earth. Alien beings often take an aggressive stance against people of Earth, though some of the more sentient alien life forms may take a more passive approach towards dealing with Earthlings, often observing them from afar. Examples of alien life forms may include the Blob, Predators, Xenomorphs, etc.
(See Also: Extraterrestrial)
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