General Hammond returns to SGC to take Dr. Jackson with him on a trip to Atlantis onboard the Prometheus. In the middle of their trip, the Prometheus picks up a distress signal and Hammond decides to investigate.
A man breaks into Jack's house and hold him at gunpoint claiming that Jack ruined his life. Seven years ago he came upon an Ancient artifact at a garage sale that allows him to see all of SG-1's missions.
After a long absence Jacob Carter returns to the SGC to tell Jack that the galaxy is under threat of takeover by the Replicators. The Goa'uld are under attack from the Replicators and are quickly being eliminated.