When the team of Roland Emmerich and Dean Devlin created the 1994 film Stargate, I doubt that they had any idea what a juggernaut the franchise would become. The centerpiece of that extended lineage is of course Stargate SG-1, which premiered in 1997 on Showtime.
Set a year after the ending of the film, SG-1 centers around Col. Jack O'Neill (now played by Richard Dean Anderson), the man who led the original mission to investigate the mysterious interplanetary portal from which the series took its name. Flanked by a loyal crew of both humans and aliens, O'Neill sets out to continue the journey of discovery that he began.
Stargate SG-1 ran for a very impressive 10 seasons, and spawned the well received spin-offs Stargate Atlantis and Stargate Universe, along with several direct to DVD movies.