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For use as the generic term 'alien' which generally refers to a life-form not of Earth, but it can also be used to describe anything, including objects, from another world or system. Use [aliens-1986] for the sequel to the 1979 film Alien; use [alien-franchise] for that entire franchise.

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If it was by Hal Clement, then Needle (1950) is by far the best match. The basic premise is that there are two shape-shifting aliens capable of symbiosis with a wide range of hosts: a "police …
answered Jul 17 '15 by Mark