Lost City (Stargate SG-1)

"Lost City" is the two-part finale to the seventh season of the science fiction television show Stargate SG-1. The episode was written by Brad Wright and Robert C. Cooper, with Martin Wood directing. The first part originally premiered on October 2, 2003, with the second part showing a week later on October 9, 2003 on Sky One in the United Kingdom. SciFi Channel in the United States then aired part one on October 12, 2003 and part two on October 19, 2003.

"Lost City" was originally conceived as a Stargate SG-1 feature film, with Brad Wright and Robert C. Cooper first discussing the project in 2001. As it developed, it was reimagined as a finale to Stargate SG-1 and the beginning of spin-off series Stargate Atlantis. Ultimately, with the knowledge that SG-1 would return for an eighth season, the story was shaped into both a season seven finale as well as informing parts of the Atlantis pilot, "Rising".

The episode had the largest budget since SG-1's pilot, "Children of the Gods". Guest stars including William Devane as President Henry Hayes and James McDaniel as General Francis Maynard returned, having first appeared in previous lead-in episode "Inauguration". Frequent guest stars Ronny Cox and Tony Amendola also returned, as Robert Kinsey and Bra'tac, respectively. Jessica Steen was introduced as Dr. Elizabeth Weir, who would later become one of the lead characters in spin-off Stargate Atlantis played by Torri Higginson. Real world Air Force Chief of Staff John P. Jumper also appeared as himself. This episode was nominated for Emmy, Gemini, and Visual Effects Society awards.