Weir is a diplomat and a leader, often making decisions in the hope they will benefit her and her people although she has clashed with others on occasions. Weir eventually leads the Atlantis Expedition which is sent through the Stargate to explore the Lost City of Atlantis.

After leaving the SGC, Weir heads to Antarctica to lead the research envoy studying the Ancient defense facility that had been discovered in Antarctica, the Ancient city of Atlantis which SG-1 had uncovered during 'Lost City Part 2'. Weir originally served as the head of the SGC after General George Hammond was reassigned in the Stargate SG-1 Season 7 finale episode, 'Lost City Part 1' with Weir serving in the role as SGC Commander up until her departure in the Stargate SG-1 Season 8 episode, 'New Order Part 2' with Weir being replaced by newly promoted Brigadier General Jack O'Neill.

Prior to joining the SGC, Weir was engaged to be married to a man named Simon Wallace but their engagement ended when Wallace refused to join the SGC. Elizabeth Weir played by Torri Higginson is the civilian and also the original leader of the Atlantis Expedition which she does for the first three years. In Season 2, Sheppard is eventually promoted to Lieutenant Colonel and still remains as Atlantis's military commander with Sheppard serving as the team leader for the Atlantis Expedition's team, the First Atlantis Reconnaissance Team or AR-1.ĭr. In Season 1, Sheppard serves as both a Major and later also becomes the military commander following Colonel Sumner's death. After some doubts, he finally joins the expedition to Atlantis, although Colonel Marshall Sumner makes it clear he is not pleased about Sheppard's involvement in the mission. When called upon to transport Brigadier General Jack O'Neill into the research base that has been established at the nearby Ancient defense facility, Sheppard inadvertently discovers that he not only has the ATA gene (the genetic factor necessary to activate Ancient technology), but that he is naturally proficient at using it. He is an experienced and a talented US Air Force Officer in Afghanistan, though his reputation is somewhat tarnished when he disobeyed a direct order in an unsuccessful attempt to save the lives of several US servicemen. John Sheppard played by Joe Flanigan is a USAF Lieutenant Colonel (ranked major in season 1).

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