Teal'c's past as First Prime of Apophis comes back to haunt him when Colonel O'Neill and Daniel Jackson are taken captive by the system lord's forces. Teal'c finds himself confronted by an old friend and fellow Jaffa, Sebe't.
SG-1 runs into trouble when the team triggers a Goa'uld trap meant for grave robbers. Infected by an unknown pathogen, Colonel O'Neill orders the team to stay put and sends for help. It arrives in the form of Dr Janet Fraiser.
When a routine gate diagnostic triggers an attack that traps him and an injured member of Stargate Command in the control room, things look set to be anything but quiet.