|Registry:||NX-2000 / NCC-2000|
The USS Excelsior (NCC-2000) was a Federation starship that was in service during the late 23rd century and 24th century. It was also the prototype for the very successful Excelsior-class of starship.
Dubbed "The Great Experiment," the Excelsior was conceived during the early 2280s as the first Starfleet vessel equipped with transwarp drive. An awe inspiring concept to some, traditional engineers were more skeptical, as in the case of Montgomery Scott, who expressed his doubt in transwarp technology with the analogy, "and if my grandmother had wheels, she'd be a wagon." (Star Trek III: The Search for Spock)
Designed under radically new principles of propulsion, the Excelsior had the potential for becoming the fastest starship in the entire Federation, as at that time, the Starfleet record for FTL travel was warp factor 14.1, set by the USS Enterprise in 2269. (TOS: "That Which Survives")
The Excelsior was days away from its first full field test of the transwarp drive, when it was unexpectedly called for duty. The crew of the USS Enterprise, attempting to rejoin Captain Spock's katra with his regenerated body, hijacked the Enterprise for an illegal trip to the Genesis Planet.
Captain Styles, confident in his new "incredible machine," was ordered to pursue as the Enterprise entered warp, fleeing the system. However, Captain Montgomery Scott, assigned as Captain of engineering aboard the Excelsior, had sabotaged the ship's transwarp computer, leaving the Excelsior dead in space. Proud of his accomplishment, Scott explained that "the more they overtake the plumbing, the easier it is to stop up the drain." (Star Trek III: The Search for Spock)
Following this embarrassing failure, the Excelsior essentially spent the next two years in Spacedock. In 2286 it was briefly ordered to be launched during an apparent attack by an alien probe, but the Excelsior, as well as the Spacedock, lost all internal power and was left stranded in its bay. (Star Trek IV: The Voyage Home)