|Out of universe information|
While working on the project, he met Langford's daughter Catherine Langford, and the two fell in love. Eventually, Langford and Littlefield were able to make the Gate work, and Littlefield went through it to Heliopolis, discovering a meeting place for the Alliance of Four Great Races. However, the DHD was damaged, and he was unable to dial home, and remained trapped there for fifty years.
In 1997, SG-1 was dispatched to rescue him after Dr. Daniel Jackson studied old films of the experiments and learned the truth about what had happened. Their reasons for traveling there were twofold; Daniel felt that they had an obligation to rescue Ernest, a true American hero for being the first person to go through the Stargate, and, with the discovery that the Stargate address Ernest had visited wasn't on the Abydos cartouche, Teal'c noted that it was likely the address could offer them advanced technology that the Goa'uld were unaware of.
Having arrived on Ernest's planet and convinced him that they were real and not hallucinations, Captain Samantha Carter was able to temporarily jump-start the Stargate using a lightning strike to allow the party return to base. Furthermore, although the gate on that planet was then found to be buried after their return, Littlefield's extensive notes of his observations during his stay on that planet provide valuable information for the Stargate Project. Ernest and Catherine decided to spend the remainder of their lives together. (SG1: "The Torment of Tantalus")
- In an alternate reality which Daniel Jackson visited in 1998, Ernest and Catherine were likewise engaged until he disappeared in 1945. It is unclear if he travelled through the Stargate as did his counterpart from our reality. (SG1: "There But for the Grace of God")