Psi 2000 was an uninhabited planet. This ancient world disintegrated in 2266. Before the sun in this system darkened, this planet was remarkably similar to Earth. Science officer Spock of the USS Enterprise believed that what happened to Psi 2000 might happen to Earth in the distant future. (TOS: "The Naked Time")
HistoryEditIn 2266, before the planet's end, a science team had been stationed on Psi 2000 on behalf of the Federation. The gravitational shifts associated with the disintegration of the planet resulted in the creation of large strings of water molecules known as polywater which resulted in the Psi 2000 intoxication.
Shortly thereafter, a landing party from the USS Enterprise beamed down to the planet and discovered the science team dead. During their investigation, Lieutenant junior grade Joe Tormolen unwittingly contracted the Psi 2000 intoxication and brought it back aboard the starship.
Suffering from the effects of the Psi 2000 intoxication, Lieutenant Kevin Riley powered down the ship's warp engines, causing the ship to begin spiraling towards Psi 2000. Chief Engineer Montgomery Scott was able to push the ship out of harm's way by initiating a cold start of the engines. (TOS: "The Naked Time")
In 2293, the location of Psi 2000 in the Milky Way Galaxy was labeled in a star chart in Captain James T. Kirk's quarters aboard the USS Enterprise-A. (Star Trek VI: The Undiscovered Country, okudagram)
Background information Edit
The 2006 remastered version of "The Naked Time" featured several updated shots of Psi 2000, most notably, a computer-generated view of the science station on the surface of the planet.
In the novelization appearing in Star Trek 1, the planet was named ULAPG42821DB, or La Pig, for short.