| SG-1 and Jack O'Neill (Richard Dean Anderson) attend a Tok'ra extraction ceremony for Ba'al (Cliff Simon), the last of the Goa'uld System Lords. He gloats that he is merely the last clone, and that the real Ba'al has a fail-safe plan. The real Ba'al travels back in time to 1939 Earth and massacres the crew of the Achilles, the ship carrying the Stargate to the United States; the captain (Mitchell's grandfather) survives long enough to keep the ship from being destroyed. In the present, people and objects disappear, starting with Vala Mal Doran (Claudia Black) and Teal'c (Christopher Judge). Jack is killed by Ba'al before Samantha Carter (Amanda Tapping), Daniel Jackson (Michael Shanks), and Cameron Mitchell (Ben Browder) manage to reach the Stargate. They emerge inside the derelict Achilles, which has drifted to the Arctic Ba'al's actions have created a timeline in which the Stargate Program never happened. After escaping from the sinking Achilles, they are rescued by a team led by Colonel Jack O'Neill. Although General Hank Landry (Beau Bridges) believes their story, permission is denied to change the timeline. The three are separated and given new lives to lead. A year passes, and SG-1 is called back into action when Goa'uld scoutships appear. Ba'al has defeated the System Lords and now stands ready to conquer Earth, with Qetesh (still residing in Vala's body) as his Queen and Teal'c as his First Prime. SG-1 is brought to President Henry Hayes (William Devane) and General George Hammond (Don S. Davis), who inform them that based on SG-1's accounts, they have recovered the Antarctic Stargate and are excavating the Ancient outpost. SG-1 is sent to retrieve a Zero Point Module (ZPM) to power the outpost. Above Earth, Ba'al's armada arrives. To the displeasure of his lieutenants (all former System Lords), Ba'al announces that he will treat the Tau'ri leniently. Suspicious about Ba'al's knowledge of Earth, Qetesh betrays him and forces him to tell her everything. She has her ships destroy McMurdo Station and the Ancient outpost, and she kills Ba'al after Teal'c discovers her treachery. As Teal'c escapes to an Al'kesh, Qetesh orders the fleet to bombard Earth while she goes to secure Ba'al's time machine. Amidst the massive Goa'uld attack, SG-1 is rerouted to Russia, as the Russians had retrieved the Achilles' Stargate from the ocean floor. En route, they are saved from a flight of death gliders by Russian MiGs. Teal'c arrives at the facility as well, seeking to use the Stargate to reach the time machine before Qetesh. The two sides form a truce and arrive together at Ba'al's time machine: a vast underground supercomputer that monitors solar flares that can affect the wormhole formed by the Stargate. SG-1 must wait for the right flare with which to go to the past, but an attack by Qetesh's troops forces them to dial Earth in the year 1929 - ten years before their target date. Sam and Daniel are killed in the firefight, and only Mitchell reaches the Stargate before Teal'c, mortally wounded, destroys the time machine along with himself and Qetesh. After a decade of waiting, an older Mitchell stows away on the Achilles and kills Ba'al and his troops when they come through the Stargate. In the present of the now-restored timeline, SG-1, completely unaware of the previous events, watches the extraction proceed without incident. On Earth, Daniel wonders what Ba'al meant by his fail-safe, but they decide not to dwell on it. The final shot shows a close-up of a picture in Mitchell's locker, in which his older alternate self is shown standing alongside his grandfather.
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| Ben Browder as Cameron "Cam" Mitchell (seasons 910 main) A United States Air Force Lieutenant Colonel who is assigned as the new commanding officer of SG-1 at the beginning of season 9. He struggles to reunite its former members under his command and commands SG-1 (with Lt. Col. Carter's assistance) until the end of season 10. He is promoted to full-bird Colonel between his appearances in Stargate: The Ark of Truth and Stargate: Continuum.
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| Michael Shanks as Dr. Daniel Jackson (seasons 15 and 710 main, season 6 recurring) A brilliant Egyptologist whose farfetched theories about pyramids led to his participation in the original Stargate mission in the feature film (where he was played by James Spader). He joins the SG-1 team in the search of his kidnapped wife in the pilot episode, but his naivety and curiosity regularly creates 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 at the end of season 5. Following his forceful de-ascension at the beginning of season 7, he rejoins SG-1 for the remainder of the series. The last three seasons show his flirty yet antagonistic relationship with Vala Mal Doran. Daniel also appears in both direct-to-DVD films and in seasons 1 and 5 of Stargate Atlantis. He is confirmed to appear in the third SG-1 film and in the pilot episode of Stargate Universe.
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| Amanda Tapping as Samantha "Sam" Carter (seasons 110 main) 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 in season 3, she is promoted to Lieutenant Colonel early in season 8 and assumes command of SG-1. The series repeatedly alludes to romantic feelings between Carter and O'Neill, but the relationship is never consummated outside of alternate reality scenarios. Carter assists Lt. Col. Cameron Mitchell in seasons 9 and 10. After her appearance in Stargate: The Ark of Truth, she is promoted to a full-bird Colonel and becomes the new commander of the Atlantis expedition in season 4 of Stargate Atlantis before joining SG-1 again for Stargate: Continuum. Carter appears in all seasons of Stargate Atlantis and will also appear in the first Atlantis direct-to-DVD film and in the third SG-1 film.
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| Christopher Judge as Teal'c (seasons 110 main) A silent and strong Jaffa alien who defects from his position as the First Prime of the Goa'uld Apophis. He joins SG-1 after the pilot episode in the hope to lead his race into freedom. Despite succeeding in this goal at the end of season 8, he remains a member of SG-1 until the end of the series. He also appears in both direct-to-DVD films and in season 4 of Stargate Atlantis.
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| Ba'al, played by South African actor Cliff Simon, is a Goa'uld based on the Ba'al of Canaanite religion. He first appears in the season 5 episode "Summit", and becomes a recurring adversary in the remaining seasons of Stargate SG-1 as well as in Stargate: Continuum, making him the longest-running villain in Stargate history. In the show, Ba'al is an intelligent and cunning System Lord, though unlike most of his peers he is rather flippant about his "godhood". At a meeting of the System Lords, Ba'al votes to accept Anubis back into their ranks. In "Abyss", he captures Jack O'Neill and tortures him for information by killing him over and over and then reviving him in a sarcophagus. Ba'al eventually turns against Anubis along with the other System Lords; due to Lord Yu's senility, he takes command of their combined fleet and destroys Anubis' mothership at Langara. Ba'al proceeds to conquer Erebus and sends an operative to Langara.
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| Claudia Black as Vala Mal Doran (season 10 main, seasons 89 recurring) A sexy con artist from an unnamed planet and a former human host to the Goa'uld Qetesh. Her first appearance in season 8's "Prometheus Unbound" is the beginning of her flirty yet antagonistic relationship with Daniel. In her recurring role in season 9, she and Daniel unintentionally set off the new Ori threat. She joins SG-1 after giving birth to the new leader of the Ori at the beginning of season 10, and appears in both direct-to-DVD films. As of April 2009, she is the only former main cast member whose non-participation in the third direct-to-DVD film has been confirmed.
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| Richard Dean Anderson as Jonathan "Jack" O'Neill (seasons 18 main, seasons 910 recurring) A United States Air Force Colonel and special operations veteran who led the original mission through the Stargate in Stargate (where he was played by Kurt Russell). 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 takes charge of Stargate Command (SGC) after his promotion to Brigadier General at the beginning of season 8. The series repeatedly alludes to romantic feelings between O'Neill and his second-in-command Carter, but the relationship is never consummated outside of alternate reality scenarios. O'Neill is reassigned to Washington, D.C. before season 9 and receives a promotion to Major General. He appears in a recurring role in seasons 9 and 10 of Stargate SG-1, as well as in Stargate: Continuum and in seasons 1 and 3 of Stargate Atlantis. O'Neill will appear as a Lieutenant General in multiple episodes of Stargate Universe. A third yet unnamed direct-to-DVD SG-1 film will centre on O'Neill.
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| Beau Bridges as Henry "Hank" Landry (seasons 910 main) A United States Air Force Major General and the commander of Stargate Command in seasons 9 and 10. He is the estranged father of the SGC's medical officer Carolyn Lam and appears in both direct-to-DVD films and in seasons 2 and 3 of Stargate Atlantis.
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| Henry Hayes, played by William Devane (season 7) The President of the United States from season 7 onwards, introduced in season 7's "Inauguration". After Vice President Robert Kinsey and NID-agent Richard Woolsey inform him about the Stargate Program and several problems at Stargate Command, Hayes replaces General Hammond with civilian Dr. Elizabeth Weir as the new commander of Stargate Command in "Lost City". Hayes then appoints Hammond to command of the Prometheus during Anubis's actual invasion on Earth and forces Kinsey into resigning. After Anubis's defeat, Hayes puts O'Neill in command of the SGC and selects Dr. Elizabeth Weir as the leader of the Atlantis expedition. His first official visit to the SGC is alluded to in season 8's "Zero Hour", and he is mentioned again in season 10's "Bad Guys". President Hayes returns in an alternate timeline in Stargate: Continuum.
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| Don S. Davis as George Hammond (seasons 17 main, seasons 810 recurring) A United States Air Force Major General (later Lieutenant General) who commands Stargate Command in the first seven seasons. Besides recurring in seasons 8 through 10 of Stargate SG-1, he appears in season 1 of Stargate Atlantis. Davis died from a heart attack in June 2008, making his appearance in Stargate: Continuum his last.
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