 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 eventually leads the Atlantis Expedition which is sent through the Stargate to explore the Lost City of Atlantis.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.