SG-1 locates the Tok’ra, a Goa’uld resistance movement who oppose the System Lords, and attempt to form an alliance. Jacob Carter’s cancer brings him near death.

SG-1 is imprisoned in a virtual reality realm and forced to relive the worst moments of their lives over and over.

SG-1 returns to Cimmeria, and finds that without protection from the Asgard the planet has been invaded by the Goa’uld.

With SG-1 trapped on Klorel’s ship, it seems that Earth is doomed as the Pyramid Ships prepare to destroy Earth.

Carter is possessed by a Goa’uld who claims to be an enemy of the System Lords.

SG-1 is put on trial and exiled to a prison world, where a woman maintains a strange control over her fellow prisoners.