The Torment of Tantalus (S01E10)

Dr. Daniel Jackson makes a remarkable discovery while going through film footage of stargate experiments conducted in 1945. It seems that the post-war team, led by Prof. Langford, succeeded in getting the stargate to work, and a young professor, Ernest Littlefield, actually traveled through the wormhole, never to return. Jackson shares this information with the professor's daughter, Catherine Langford, who oversaw the stargate project for years and who was engaged to Littlefield when he disappeared. Using computer-enhanced pictures as a guide, the SG-1 team, joined by Langford, goes in search of Littlefield. They find the professor, now grown old, as well as a remarkable room that seems to have been the meeting place of four alien civilizations. There's only one problem: the dial-home device on this stargate is severely damaged — which means that Langford and the SG-1 team might be trapped on this world forever. (Metro-Goldwyn-Mayer (MGM))