Deep Space 9, originally known as Terok Nor, was one of the most historically, politically, and strategically important space stations in the Alpha Quadrant during the latter half of the 24th century. The characters are so real - Kira, Garak and O'Brien were my favourites this time, and I …

A large fleet of more than fifty Jem'Hadar warships bypassed the station and moved instead to annex the Cardassian Union – at the invitation of Gul Dukat. Quark even once referred to the station as "Wormhole Junction". At the same time, Kira and Rom attempted to sabotage the antigraviton emitter in order to preserve the minefield. A previously-unknown group in the Cardassian Demilitarized Zone, calling themselves the Maquis, claimed responsibility.

The cardassian space station Deep Space 9, originally known as Terok Nor, was one of the most historically, politically, and strategically important space stations in the Alpha Quadrant during the second half of the 24th century. According to Star Trek: Star Charts (p. 43) in 2369, the station moved from a geosynchronous orbit around the planet Bajor to a solar orbit around the star Bajor (B'hava'el) shortly after it was recommissioned as Deep Space 9. Ricardo Delgado, Joseph Hodges, Nathan Crowley, Jim Martin, Rob Legato, Gary Hutzel, Michael Okuda, and executive producer Rick Berman also contributed to the design. The station was renamed "Deep Space 9", and Benjamin Sisko was appointed as commander, at Admiral Leyton's recommendation.

According to the Stellar Cartography: The Starfleet Reference Library ("The Dominion War: Strategy and Battles, 2373-75"), Deep Space 9 was captured by the Dominion on December 23, 2373.

Because almost all of the shops were owned by non-Bajorans, Sisko hoped to convince many of them to stay to help build a trade network through Bajoran space. General Krim and Colonel Day, commanding the force, engaged in a cat-and-mouse game with the small Starfleet contingent for two days. The station builds on the legacy of the Cardassian-Federation interactions introduced by that show and the first episode, "Emissary", includes a visit from the Enterprise-D.

The station is featured in the opening for all 176 episodes of Deep Space Nine, as well as part one of the Star Trek: The Next Generation episode "Birthright" and the first Star Trek: Voyager episode "Caretaker". The alternate reality version of Terok Nor appears in the Star Trek: Ongoing story arc The Q Gambit. (DS9: "The Way of the Warrior"), Throughout 2372, the Klingon presence continued to be a potential threat for the station and the surrounding area of space, including a Klingon attempt to mine the Bajoran system. In response, the Dominion launched a massive assault fleet to capture the station and take control of the wormhole. (DS9: "By Inferno's Light"), Deep Space 9's greatest fame, however, came in its role of defending the Federation and the Alpha Quadrant from Dominion invasion. In the game, Deep Space 9 was seen orbiting Bajor like it did in DS9: "Emissary", possibly suggesting that the station moved back to Bajor after the Dominion War from the Bajoran wormhole.

However, because the minefield operated independently from the station, Terok Nor played no other important role in the Dominion war effort aside from serving as a command and resupply outpost. (DS9: "Emissary", "Homefront"), As station commander, one of the most important facets of the station Sisko sought to develop was commerce.

Around stardate 47950, Benjamin Sisko and Quark, while on a camping trip in the Gamma Quadrant with Sisko's son, Jake, and Quark's nephew, Nog, were abducted by the Jem'Hadar, the soldiers of the Dominion.

Deep Space 9 had a number of support vessels on hand. (DS9: "Visionary"), In an alternate timeline, in which Benjamin Sisko was apparently killed in an accident aboard the USS Defiant, DS9 was transferred to Klingon control in 2373 and was still under their control around 2422. A Klingon fleet led by the Klingon flagship IKS Negh'Var arrived at the station, with the stated intent of protecting the station against the Dominion.

The station was armed with phasers and photon torpedo launchers.

After the start of this war, the Cardassian Detapa Council was evacuated to the station, Klingon ships attacked the station, but eventually withdrew. Deep Space Nine provides the location for the crew to interact with the characters and elements established by the Star Trek universe, and introduces additional elements. It later became a key strategic location during the Dominion War for both the Dominion and the Federation Alliance. Unable to move the station across interstellar distances, they left the outpost in its high orbit. A representative of the Dominion boarded the station and informed the crew that the Dominion would not tolerate "intrusions" into its territory – and intrusions were defined as any vessel that entered the Gamma Quadrant.