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The Tollan inform the SGC that Klor'el/Ska'ara have crash-landed on their planet and that they will hold a trial to determine which has the right to Ska'ara's body. SG-1 is invited to Tollan to act as his defense.
When SG-1 returns from a mission, everyone at the SGC is acting strangely.
SG-1 travels to a paradisical-appearing planet... only to step immediately back out of the Stargate with no memory of their trip. They soon find themselves engaging in odd behavior, and find out that a computer chip has been planted in their minds during their memory blackout.
Tthe third season follows SG-1 in their fight against the Goa'uld Empire's System Lords, the main being Sokar and then Apophis . The season introduces the long unseen and unnamed enemy of the Asgards, the Replicators who are self-replicating machines that seek to convert all civilizations into more of themselves, thus posing a dire threat to all other beings.