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STNG : Gomtuu
Gomtuu was a living spaceship who seemed to have been "born" far from Federation space, possibly in another galaxy. Like a traditional starship, Gomtuu possessed a warp drive, transporter capability, and was fully equipped to defend itself. However, much of its technology was beyond that known to Federation science. Upon its discovery it was dubbed "Tin Man" by Starfleet and the "Star Creature" by the Romulans.
Viewed from the exterior, Gomtuu was a massive, dark-colored starship shaped like a sunflower seed shell. Its interior cavity consisted of a series of chambers and corridors with gravity and atmosphere to support carbon-based lifeforms. Its amorphous interior was also capable of growing furniture and equipment from its walls and floors.
Gomtuu was manned by a crew until an explosion in space generated radiation that penetrated Gomtuu's "hull", killing the crew. Gomtuu wandered the galaxy for millennia after the traumatic experience, vainly searching for more of its kind. Alone and without a purpose, it eventually decided to commit suicide by orbiting the soon-to-go-supernova star Beta Stromgren.
In 2366, "Tin Man" was detected when Starfleet sent the Vega Nine probe to monitor the supernova. At the same time, the Romulans also discovered Gomtuu and a race was on to get to it first. As the alien did not respond to traditional communication methods, the Federation sent Tam Elbrun, a highly telepathic Betazoid to make first contact.
The Federation established contact first through Elbrun, who telepathically warned Gomtuu of the Romulans. Gomtuu then demonstrated its defensive capabilities, destroying the Romulan Warbird and heavily damaging the USS Enterprise-D utilizing an energy wave. Later, with Elbrun and Data on board, Gomtuu came about and fired a second energy wave which propelled the Enterprise-D and a second Warbird 3.8 billion kilometers through space.
Gomtuu then teleported Data back onto the bridge of the Enterprise (through the Enterprise's shields) and disappeared with Elbrun to parts unknown. Elbrun provided Gomtuu with an alternative to suicide, and Gomtuu provided Elbrun with tranquility. (TNG: "Tin Man")