Atrapados en otra galaxia mientras huyen del ataque a la flota de Apophis, resulta ser solo el comienzo de los problemas de SG-1, ya que aparecen múltiples enemigos.

Cuando SG-1 huye de una expedición con el Coronel O'Neill y un miembro misterioso del equipo llamado Tyler, del que nadie más sabe, quedan varados y se cuestiona la aptitud del equipo.

In a firefight with Jaffa, Teal'c takes a staff blast to the gut. Without his symbiote, he cannot regenerate as he once did. Daniel feels that he cannot remember something important, so he goes searching through the logs for any sign of his lost knowledge. Teal'c expresses his feelings that the Tritonin has made him weak.

SG-1 es enviado para advertir a Harry Maybourne de que el Señor del Sistema goa'uld Ares está llegando al planeta donde fue desterrado, y en el proceso descubren lo que podría ser una máquina del tiempo antigua.

Teal'c and Bra'tac are among the numerous victims -though only wounded- of several bomb attacks killing 32 men at a summit in the Jaffa settlement Dar Eshkalon. As soon as physically able, Teal'c swears to avenge them personally, suspecting the honor-less, ambitious warrior Arkad; General Landry refuses to sanction a killing mission without solid proof, but cannot stop Teal'c from going it alone. Bra'tac explains Arkad's sinister past to Daniel, including the possibility of murdering Teal'c's mother. Information from the resistance on another planet indicates Arkad is in league with the Ori and plans to attack Earth. Arkad comes to meet General Landry, offering to help defend Earth against the Ori, denying any part in the bombings, while defending Origin, incriminating a Jaffa sect. SG-1 is now ordered to find and stop at all cost Teal'c, who is using torture. But Teal'c, committed to killing Arkad, reaches his place, but is wounded, captured, and made to duel Arkad after it is confirmed he had killed Teal'c's parents.