Serpent's Song

S2, E18: Pursued by Goa'uld death rays former Goa'uld conqueror and sworn enemy of SG-1 Apophis throws himself at the mercy of the team and despite his past evil they grant him sanctuary. Apophis who shows signs of torture is slowly dying and promises all the knowledge of the Goa'uld in return for a new host body. When O'Neill rejects his offer Apophis reveals that he is pursued by an ancient and powerful Goa'uld named Sokar the original god of death. Conquered by Apophis in Egyptian times Sokar has come to wreak his revenge and will kill anything that stands between him and his ancien adversary. The team's Tok'ra ally Martouf tells SG-1 that unless Apophis is sent back to face his fate all those around him will be destroyed either by Sokar or the many Goa'uld who wish their former leader dead.