His mind altered by Apophis, Teal'c must undergo a ritual that takes him to the edge of death itself, in order for him to rediscover who he is.

O'Neill and Lieutenant Tyler are ambushed by Goa'uld forces and trapped behind enemy lines -- while the rest of their team discover they don't know who Tyler is.

Cassandra mysteriously falls ill, sending SG-1 back to her home planet -- where they uncover a dark Goa'uld secret.

The team finds an impoverished world enslaved by a Goa'uld underlord, but their plans to free it may be compromised when Jonas experiences unexplained visions of the future.