Stargate is a military science fiction and media franchise based on the film written by Dean Devlin and Roland Emmerich.
The franchise is based on the idea of an alien Einstein–Rosen bridge device (the Stargate) that enables nearly instantaneous travel across the cosmos.
The franchise began with the film Stargate, released on October 28, 1994, by Metro-Goldwyn-Mayer and Carolco, which grossed US$197 million worldwide.
In 1997, Brad Wright and Jonathan Glassner created a television series titled Stargate SG-1 as a sequel to the film.
This show was joined by Stargate Atlantis in 2004, and a third spin-off series, Stargate Universe, in 2009.
Also consistent with the same story are a variety of books, video games and comic books, as well as the direct-to-DVD movies Stargate: The Ark of Truth and Continuum, which concluded the first television show after 10 seasons.
In 2011, Stargate Universe, the last Stargate program on television, ended its run and the franchise has been in limbo since.
Brad Wright announced that there were no more plans to continue the same story in further productions.
The predominant story arc thus ran for 17 years and includes 17 seasons (354 episodes) of programming.
However, a variety of other media either ignore this main story arc, or reset it, while maintaining essential elements that define the franchise (mainly, the inclusion of a Stargate device).
These include the 2002 animated series Stargate Infinity, and a possible new film series once again directed by Roland Emmerich, announced as being under consideration in 2014.