Star Trek: Deep Space Nine (sometimes abbreviated to ST: DS9 or DS9) is a science fiction television series set in the Star Trek

Star Trek

Star Trek is an American science fiction entertainment franchise created by Gene Roddenberry. The core of Star Trek is its six television series: The Original Series, The Animated Series, The Next Generation, Deep Space Nine, Voyager, and Enterprise...

 universe. Set in the 24th century from the year 2369 through 2375, it took place on a space station instead of a starship, so as not to have two series with starships at the same time (the starship USS Defiant

USS Defiant

The USS Defiant is a fictional starship in the television series Star Trek: Deep Space Nine and the feature film Star Trek: First Contact...

 was introduced in season 3, but the station remained the primary setting for the show).