Deep Space Nine (DS9; previously Terok Nor) is a fictional space station, the eponymous primary setting of the American science fiction television series Star Trek: Deep Space Nine which aired from 1993 to 1999. It serves as a base for the exploration of the Gamma Quadrant via the Bajoran wormhole and is a hub of trade and travel for the sector's denizens. It is run by a joint crew of Starfleet and Bajoran officers and it is the home port of a number of Starfleet runabouts, as well as the starship USS Defiant.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", the first Star Trek: Voyager episode "Caretaker", and the Star Trek: Lower Decks episode "Hear All, Trust Nothing". Many story arcs introduced on Next Generation are extended by events that occur on the station. 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. 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. The station exists in a time and place also occupied by The Next Generation, Voyager, Lower Decks and the seventh through tenth films, the 2370s through early 2380s. This is itself part of the bigger Star Trek universe, which was initiated by the original Star Trek TV show of the late 1960s created by Gene Roddenberry. Source: Wikipedia (en)