|Richard Dean Anderson as Jonathan "Jack" O'Neill: Stargate|
Richard Dean Anderson as Jonathan "Jack" O'Neill: Stargate"Richard Dean Anderson as Jonathan "Jack" O'Neill (seasons 1–8 main, seasons 9–10 recurring) – A United States Air Force colonel and an Air Force 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 shown as consummated outside 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 appears as a lieutenant general in multiple episodes of Stargate Universe where he is in command of the Department of Homeworld Security."
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