Thestory of Stargate SG-1 begins about a year after the events of the feature film when the United States government learns that an ancient alien device called the Stargate can access a network of such devices on a multitude of planets and in space. SG-1 is an elite United States Air Force special operations team, one of about 20 teams from Earth who explore the galaxy and defend against alien threats such as the Goa'uld, the Replicators and the Ori. The series draws upon Egyptian, Greek and Norse mythology, as well as the legend of King Arthur.
The plot of Stargate SG-1 picks up a year after the conclusion of the events recounted in the original feature film. It follows the adventures of SG-1, a military team from Earth. SG-1 and a dozen other SG teams venture to distant planets using an alien portal known as a Stargate, which in the series is housed in a top-secret United States Air Force military base known as Stargate Command (SGC) in the underground Cheyenne Mountain Complex in Colorado Springs, Colorado. In the first eight seasons, the mission of the SG teams is to explore the galaxy and search for alien technology and allies to defend Earth against the Goa'uld, a snake-like parasitic alien race from planet P3X-888 that takes humans as unwilling hosts. As explained in the series' backstory, the Goa'uld had transported human slaves from Earth to other habitable planets across the galaxy thousands of years ago and now pose as gods of old Earth mythologies, particularly Ancient Egypt. SG-1 eventually learns that highly evolved human-like beings, known as the Ancients, had originally built the Stargate network millions of years earlier, before ascending to a higher plane of existence, after which they pledged not to interfere in the lives of other species. The Ori, a faction of the same race as the Ancients who instead use their powers to subjugate other species by religious indoctrination, assume the role of the main antagonists in Season 9 and Season 10.
The pilot episode ("Children of the Gods"), set one year after the events of the original feature film, introduces the Goa'uld System Lord Apophis (Peter Williams) as the main villain when he attacks Earth's mothballed SGC military base through the Stargate and kidnaps an airman. The SGC is brought back into action when the Stargate is revealed to be part of an interplanetary network connecting countless planets. SG teams are created to help defend Earth against the Goa'uld, who have interstellar pyramid warships and vast armies of Jaffa (hereditary slaves and human incubators to the Goa'uld) at their disposal. Earth's flagship team SG-1, which includes Apophis's defected First Prime (lead Jaffa soldier) Teal'c, initiates several alliances with other cultures in the galaxy, such as the Goa'uld-like but truly symbiotic Tok'ra, the advanced human Tollan, the pacifist Nox, the benevolent Roswell-alien Asgard and remnants of the powerful Ancients. Another alien threat arises in the Season 3 finale ("Nemesis") in the form of sentient machines called Replicators. Meanwhile, rogue agents of a shadowy intelligence agency on Earth, the NID, repeatedly attempt to take control of the Stargate and other alien technology. Despite Apophis's death in the beginning of Season 5, the Goa'uld Empire remains a major foe in Stargate SG-1 until the end of Season 8. The only influential Goa'uld in the last two seasons of Stargate SG-1 is the System Lord Ba'al (Cliff Simon), who is defeated in the direct-to-DVD film Stargate: Continuum.
After Apophis's defeat in the Season 5 premiere ("Enemies"), the half-Ascended Goa'uld System Lord Anubis (David Palffy) assumes the role of the primary antagonist of the show. This new villain possesses much of the knowledge of the Ancients and their technology. While Earth builds its first interstellar spaceship (the Prometheus) in seasons Season 6 and Season 7, Anubis creates an army of almost invincible Kull Warriors and wipes out or subordinates most of his adversaries amongst the System Lords. In the Season 7 finale ("Lost City"), SG-1 discovers a powerful weapon in an Ancient outpost in Antarctica that annihilates Anubis's entire fleet and also sets the stage for the spin-off series Stargate Atlantis. Ba'al subsumes much of Anubis's power in Season 8, while Anubis, who survived the destruction of his fleet in a disembodied form, quietly begins to re-assert his influence. Human-form Replicators begin to conquer the System Lords, but SG-1 finds and adjusts an Ancient weapon to destroy all Replicators throughout the galaxy. Near the end of Season 8 ("Threads"), it is revealed that the benevolent Ascended being Oma Desala (Mel Harris) is responsible for Anubis's original ascension. When she engages Anubis in an eternal stalemated battle on the Ascended plane to prevent his acting on the mortal plane, the Replicators and most System Lords have already been annihilated and the Jaffa win their freedom from Goa'uld rule.
The original SG-1 team disbands after the events of Season 8, but slowly reunites under new team leader Lt Col. Cameron Mitchell after the SGC inadvertently draws the attention of the Ori to the existence of sentient life in the Milky Way; the Ori are revealed to be a faction of ascended Ancients residing in another galaxy that are diametrically opposed to the Ancients' belief in strict noninterference in the lower planes of existence, sapping the energy from untold billions of "lower beings" (non-ascended sentient beings) by means of their worship in a religion called Origin. While the Ori send enhanced human beings named Priors to the Milky Way to convert the galaxy to Origin, Ba'al and some minor Goa'uld infiltrate Earth through The Trust (a coalition of rogue NID operatives) to rebuild their power. At the end of Season 9 ("Camelot (Part 1)"), the Ori begin an evangelistic crusade with their warships and effortlessly wipe out the combined fleet of Earth and its allies. The leader of the Ori, Adria (Morena Baccarin), is introduced in the premiere of Season 10 ("Flesh and Blood (Part 2)"). SG-1 searches for the Sangraal, an Ancient weapon that might defeat the Ori, while Ba'al and his clones attempt to find the weapon for their own purposes. With the help of the powerful Ancient Merlin (Matthew Walker), SG-1 finds the construction plans of the Sangraal and sends a working version to the Ori galaxy. Shortly thereafter, Adria ascends. The direct-to-DVD film Stargate: The Ark of Truth ends the Ori Arc.
Brad Wright and Jonathan Glassner had worked together on the MGM television series The Outer Limits since 1995. Upon hearing of MGM's plan to create a television spin-off series of the feature film Stargate, Wright and Glassner independently and unbeknownst to each other approached MGM and proposed their concept for the television series. MGM president John Symes greenlit the project on the condition that Wright and Glassner work together as executive producers of the new show.[4] The show was named Stargate SG-1 after Wright flightily agreed to Symes's pitch question of whether the team should be called "SG-1". MGM released posters titled Stargate SG-1 within the next week without the knowledge of Wright or Glassner.[7]
John Symes approached Michael Greenburg and Richard Dean Anderson, former star of the long-running MacGyver.[4] Anderson agreed to become involved if his character Jack O'Neill were allowed more comedic leeway than Kurt Russell's character in the feature film. He also requested that Stargate SG-1 be an ensemble show, so that he would not be carrying most of the plot alone as he had on MacGyver.[8] The American subscription channel Showtime made a two-season commitment for 44 episodes in 1996.[4] Principal photography began in Vancouver in February 1997.[9]
After Anderson accepted the part, Brad Wright and Jonathan Glassner reviewed several thousand taped auditions and invited approximately 25 promising actors to screen tests in Los Angeles.[10] Michael Shanks, Amanda Tapping and Christopher Judge are said to have gravitated towards each other during the casting process before they knew that they would ultimately be cast.[11] The producers found Judge the easiest to cast due to his muscular presence.[4] Shanks was cast because he did "the perfect imitation of James Spader", according to Wright.[4] The producers knew Don S. Davis from his work as a stand-in and stunt-double for Dana Elcar in MacGyver and approached him to read for the role of George Hammond.[12][13]
Showtime's announcement that it would not renew Stargate SG-1 after Season 5 coincided with Michael Shanks's decision to leave the show over concerns of being underutilized.[14] The Sci Fi Channel picked up the show[15] and substituted a new character, played by Corin Nemec. Casting agents had met Nemec in the courtyard of MGM's Santa Monica offices by chance and had offered him the role of Jonas Quinn.[16] Addressing rumors that it had forced Shanks's departure, Sci Fi said in February 2002 that the network had "absolutely never requested that any cast changes be made... and although we regret the loss of Michael Shanks, we think that Corin Nemec will be a great new presence in the cast."[17] Nemec's early appearances, beginning with the penultimate episode of Season 5 "Meridian", failed to win over some of the show's fans.[14] Nemec was willing to continue playing the character after Season 6 or in a feature film or a spin-off series.[16] However, the producers reached an agreement with Shanks to return full-time in Season 7, leaving Nemec with a recurring role.[18] Don S. Davis left Stargate SG-1 after Season 7 for health reasons,[19] but appeared in a recurring capacity until his death on June 29, 2008.
Due to prior engagements, Claudia Black of Farscape fame could not accept the offers to guest-star on Stargate SG-1 until the Season 8 episode "Prometheus Unbound".[20] The producers liked the on-screen chemistry between Black's Vala Mal Doran and Shanks's Daniel so much that they re-introduced her in a six-episode story Arc to cover for the maternity leave of Amanda Tapping at the beginning of Season 9.[21] At the same time, Richard Dean Anderson left the show to spend more time with his daughter (his schedule had been reduced incrementally since Season 6).[22] The role of the leading man was filled with Ben Browder (also of Farscape fame), who had met with the Stargate producers as soon as the introduction of new main characters for Season 9 was discussed.[23] The producers had met him during sci-fi conventions and had previously discussed casting him in other Stargate roles.[24] The producers approached Emmy Award-winning actor Beau Bridges directly to play the role of Hank Landry.[25] Claudia Black's guest appearances were so popular with the cast, crew and audience[21][26] that the actress returned for the last two Season 9 episodes (with her pregnancy worked into the plot) and she joined the cast full-time in Season 10.
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