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The Asgard wish to include Earth in their protected planets treaty with the Goa'uld, which will save them from an attack. The negotiations are to take place at the SGC.
The Tok'ra believe that the ancient Goa'uld System Lord, Seth, is hiding on Earth posing as a religious leader. SG-1 and the Tok'ra Selmak must find him without falling victim to his brainwashing powers.
Daniel starts going crazy after SG-1 visits a planet where SG-1 found nine dead Goa'uld. The doctors believe he is suffering from the effects of traveling through the gate.
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.