The story 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. 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 primarily upon Egyptian mythology, Greek mythology, Norse mythology and Arthurian legend.
The four main characters of the SG-1 team are as follows.
Jonathan "Jack" O'Neill – A United States Air Force Colonel and an Air Force Special Operations veteran who led the original mission through the Stargate in Stargate. He is coaxed out of retirement in the pilot episode, and serves as the leader of the SG-1 team in the first seven seasons. He later takes charge of Stargate Command (SGC) after his promotion to Brigadier General.
Daniel Jackson – A brilliant Egyptologist whose far-fetched theories about Egyptian pyramids having been built by aliens led to his participation in the original Stargate mission in the feature film. He joins the SG-1 team to facilitate his search for his wife, who was kidnapped by Apophis in the pilot episode, but his naïveté and curiosity regularly create obstacles for the team. He gradually evolves from being an archaeologist and translator, into the moral conscience for the team, and remains part of SG-1 until he ascends to a higher plane of existence.
Samantha "Sam" Carter – A brilliant young astrophysicist and United States Air Force Captain who joins SG-1 under the command of Col. O'Neill in the pilot episode. Following her promotion to Major, she is promoted to Lieutenant Colonel and assumes command of SG-1.
Teal'c – A quiet and strong Jaffa alien who defects from his position as the First Prime of the Goa'uld Apophis. He joins SG-1 in hopes of leading his race to freedom. Despite achieving this goal, he remained a member of SG-1.
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