Synopsis by Hal Erickson
Resolving the cliffhanger ending established at the end of season two, season three of Stargate SG-1 finds evil Goa'uld queen Hathor (Suanne Braun) still trying to win SG-1 teammates Jack O'Neill (Richard Dean Anderson), Samantha Carter (Amanda Tapping), and Daniel Jackson (Michael Shanks) over to her side -- while the team's Jaffan ally Teal'c (Christopher Judge). In the midst of this tense situation comes some good news; Carter's father Jacob (Carmen Argenziano) -- saved from the brink of death when his body became host for Selmak, a leader of the Goa'uld resistance movement Tok'ra -- has now joined his daughter and her comrades in the ongoing battle to protect Earth from hostile aliens who've penetrated the many Stargate portals throughout the galaxy. In later episodes, a killer parasite plunges Jackson into madness and threatens the sanity of the other team members, which may force General Hammond (Don S. Davis) to kill them all "for the greater good"; Hammond himself later becomes a liability to the Stargate Project thanks to a race of "morphing" aliens; the Quantum Mirror, a device introduced during the series' first season, once again causes profound personality changes in the protagonists when they pass into an alternate-reality Earth; and in a plot right out of a WWII spy picture, O'Neill and his crew come face to face with young alien warriors who've been trained to impersonate Stargate personnel for the purposes of infiltration and ultimate domination. Also, Jackson must make a crucial decision about his future after Teal'c is forced to kill Jackson's alien wife Sha're (Vaitaire Bandera). A "necessary" bit of thievery results in O'Neill's resignation in disgrace from the Stargate program -- and into the greedy clutches of con artist supreme Col. Maybourne (Tom McBeath). And in the two-part "Jolinar's Memories," the fate of the crew as they attempt to infiltrate the (literally) Hellish prison moon Sokar is in the hands -- and the mind -- of Samantha Carter. Likewise offered as a two-parter is the season's cliffhanger finale, in which the Earth is once again threatened with invasion -- this time by metallic Replicator bugs. In order to save mankind, O'Neill and the team may be forced into an act of mass suicide!