The Torment of Tantalus

S1, E10: 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 Professor Langford succeeded in getting the Stargate to work and a young professor Ernest Littlefield actually traveled through the wormhole never to return. Daniel shares this information with the professor's daughter Catherine Langford who oversaw the Stargate project for years and who was supposed to marry Littlefield before he disappeared. Using computer-enhanced pictures as a guide the SG-1 team joined by Langford go 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 and Langford and the SG-1 team may be trapped forever.