As a fleet of Goa'uld warships heads toward Earth threatening to destroy it the Stargate facility prepares for the worst sending the best and brightest of American society through the Stargate to a safe Alpha site. Meanwhile O'Neill and the SG-1 team use the Stargate to board a ship commanded by Apophis' (Peter Williams) son Klorel (Alexis Cruz). The SG-1 team is on a suicide mission planting explosives in an attempt to stop the attack. They are captured by Teal'c's Jaffa mentor Bra'Tac (Tony Amendola) who joins their fight hoping to overthrow Goa'uld domination of the Jaffa. Bra'Tac knows the weaknesses of the Goa'uld ship and reveals a plan to stop them. The plan means almost certain death for both the SG-1 team and Bra'Tac but they all realize that is is the only way to save the Earth and set the Jaffa free.