Weir joins the SGC team as the civilian who takes over command of the SGC when Hammond is promoted to other duties. She offers a slightly less military perspective on things that grates on the nerves of some to the older members, such as Jack O'Neill. After helping to stop Anubis she leaves the SGC under the command of O'Neill and takes command over the Atlantis expidition. When they find themselves trapped in Atlantis Weir becomes the authority in which all must deffer to, all but Sheppard who doesn't really take to authority. She successfully administers the city under extreme circumstances and is well liked by those around her.