Stargate SG-1 was an American science fiction television series that ran from July, 1997 to March, 2007, spanning a total of 213 episodes over the course of ten seasons, making it the longest-running episodic American sci-fi series to date. The show was a spin-off of the 1994 feature film Stargate and spawned two spin-off programs of its own, Stargate: Atlantis and Stargate: Universe, as well as a short-lived animated series and two direct-to-video sequel films. The first five seasons of the series were broadcast on the Showtime cable network, with the remaining seasons airing on the Sci-Fi Channel (later known as Syfy). All episodes of the series have been released to DVD in both standard snapcase edition and slimline edition.

The premise of the series revolved around the top-secret US Air Force special unit SG-1 who, still possessing the Stargate portal recovered in the original film, explore dozens of various worlds, encountering strange, alien races, both peaceful and aggressive. Their most notable adversaries include the parasitic Goa'uld and the cosmic cult known as the Ori.