Star Trek: Deep Space Nine (DS9) is an American science fiction television series created by Rick Berman and Michael Piller. It originally aired from January 1993 to June 1999, in syndication, spanning 176 episodes over seven seasons. The fourth series in the Star Trek franchise, it served as the third sequel to Star Trek: The Original Series. Set in the 24th century, when Earth is part of a United Federation of Planets, its narrative is centered on the eponymous space station Deep Space Nine, located adjacent to a wormhole connecting Federation territory to the Gamma Quadrant on the far side of the Milky Way galaxy.