Stargate SG-1: Season 8, Episode 19

8 - 19: Moebius

SG-1 and General O'Neill use the time traveling puddlejumper to go to Ancient Egypt to recover a ZPM. They successfully steal it, but something is wrong and the future is altered to that the Stargate program never happened. Daniel, Sam, and Jack must find a way to save their reality despite never having met before.