Offworld, SG-1 is attacked by Jaffa of the Sodan, and Mitchell is wounded in a fight with one of them. Thinking that the Jaffa was killed, the other Jaffa take Mitchell back to their village to be trained for a fight to the death.

After an SGC officer returns to Earth after unknowingly being infected with the Ancient Plague, the virus quickly spreads throughout the United States. Not wanting the Ori to gain control of the Milky Way Galaxy, Orlin yet again descends to help Carter find a cure.