Gomtuu

History:
An ancient spaceborne organism, the last of a species of living spacecraft that shared symbiotic relationsships with their crews. Gomtuu's crew died when radiation from an explosion penetrated its skin. Gomtuu was a social being, and with no crew to care for, it became lonely. Wandering aimlessly for millennia, Gomtuu finally decided to die at Beta Stromgren. First contact specialist Tam Elbrun, sent to establish relations with Gomtuu (code-named Tin Man by Starfleet), found the living spaceship to be a kindred spirit, and the two new friends went off into the unknown together.
TNG "Tin Man" ; Star Trek Encyclopedia II

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