Season 3

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06.25.99 Into the Fire
 Trapped on Hathor's planet, Carter and Daniel can only watch helplessly as Hathor implants O'Neill with a Goa'uld symbiote. General Hammond sends Colonel Makepeace and six Stargate units to reclaim SG-1, but when the units are defeated, Hammond decides to do the job himself. (Part 2 of 2)
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07.02.99 Seth
 Carter's father, Jacob, enlists the SG-1 team in his hunt for the ancient Goa'uld Lord Seth, whom he believes is hiding on Earth. A computer search reveals Seth has maintained power on Earth for thousands of years using false religion, and the SG-1 team trace him to a heavily armed compound in Washington state.
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07.09.99 Fair Game
 Asgard leader, Thor, tells O'Neill that the Goa'uld System Lords plan to attack Earth, and offers help in negotiating a peace deal. Three System Lords attend the session, Yu, Nirrti, and Cronus. The three initially agree to the Asgard's peace proposal, on the condition that Earth gives up the Stargate.
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07.16.99 Legacy
 During a routine mission, the SG-1 team discovers a room containing the corpses of a league of Goa'uld who challenged the System Lords. One is holding a tablet, and after Daniel touches it, he begins to hear voices and see nightmarish visions. Medical tests indicate schizophrenia.
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07.23.99 Learning Curve
 In the pursuit of knowledge, Jack O'Neill, Teal'c, and Daniel Jackson travel to the planet Orban as part of an exchange program. O'Neill and the rest of SG-1 soon discover that the children on this planet are used to acquire knowledge for the entire population, then discarded.
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07.30.99 Point of View
 The SGC is taken aback when an alternate reality version of Samantha Carter and the deceased Major Kawalsky are found in top secret Area 51. To transport themselves to our reality, they used the quantum mirror (last seen in season one's There But For The Grace of God).
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08.06.99 Deadman Switch
 SG-1 travels to planet PJ6-877 for a routine exploration. Almost immediately after arriving, they are captured in an invisible force-field by alien bounty hunter Aris Boch, who is hunting a Goa'uld wanted by the evil System Lord Sokar. He attempts to solicit help from SG-1, in exchange for their freedom.
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08.13.99 Demons
SG-1 arrives at a medieval village and frees Mary, a young woman who has been left outside tied to a stake. Simon, friar of the village and Mary's friend, explains that Mary is a sacrifice for the demon that plagues their village. The Canon chose her when he mistook her illness for evil possession.
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08.20.99 Rules of Engagement
Upon exiting the Stargate, SG-1 finds itself in the midst of battle. A group of SG soldiers battles a Jaffa army. Believing the soldiers to be the missing-in-action SG-11 team, O'Neill and the others provide assistance. Much to their surprise, the mystery SG team turns their weapons on SG-1.
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10.08.99 Forever in a Day
 As SG-1 attempts a rescue of captured Abydonians, Daniel sees his long-lost wife Sha're watching the activity from a nearby tent. He follows her inside, where Sha're, who is actually the Goa'uld Amonet, takes Daniel in the grip of a Goa'uld ribbon device. Teal'c enters the tent with his staff weapon as Daniel falls unconscious.
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10.15.99 Past and Present
 SG-1 travels to a planet whose inhabitants seem to be suffering from mass retrograde amnesia. They have no memory of their lives before the unknown event they call the "Vorlix", and report that their elders and children are missing. Their archives mention the arrival of Lenaia (see season two's Prisoners). The planet faces complete devastation unless the people's memories can be restored.
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10.22.99 Jolinar's Memories
 The Tok'ra Martouf arrives at the SGC with troubling news: Major Carter's father, Jacob, and his Tok'ra symbiote Selmak, have been captured by the evil Goa'uld System Lord Sokar. Jacob/Selmak is imprisoned on a moon called Netu, which Sokar has transformed into a literal Hell. (Part 1 of 2)
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10.29.99 The Devil You Know
 During an attempt to rescue Jacob Carter, SG-1 and Martouf have been captured by Apophis, now one of Hell's denizens, who is determined to use their information to overthrow Sokar. With Tok'ra memory technology and a hallucinogenic drug, each prisoner is forced to relive vivid, painful memories. (Part 2 of 2)
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11.05.99 Foothold
 En route to the infirmary after a mission, SG-1 learns that part of the SGC has been sealed off due to a chemical leak. Soon after, Dr. Fraiser injects each member of the team with a sedative, rendering them unconscious. Teal'c is the first to awaken, and secretly observes Dr. Fraiser and General Hammond talking with two aliens.
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01.21.99 Pretense
 The Tollan Narim pays an unexpected visit to the SGC, inviting the members of SG-1 to participate in "Triad." When SG-1 shows up on the new Tollan home world, they learn that the Triad is an ancient ceremony of justice, and the person on trial is their old friend Skaara.
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01.28.99 Urgo
 SG-1 steps through the Stargate on their way to a paradise planet and end up back at the SGC. Adding to their confusion is Hammond's assertion that the team was gone for fifteen hours. An analysis of the MALP data reveals a brief initial image of an alien lab just before the paradise view.
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02.04.99 A Hundred Days
 Colonel O'Neill and the rest of the SG-1 team have established ties with a small village on the planet Edora, and their leader Laira, with whom O'Neill shares a mutual and quiet attraction. Everyone gathers to watch the annual meteor shower referred to by the natives as "fire rain."
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02.11.99 Shades of Grey
 SG-1 travels to Tollana to negotiate a trade. O'Neill becomes annoyed when the Tollans refuse to cooperate due to their fear that any weaponry given to Earth would likely be used on itself than against the Goa'uld. In an act that shocks the rest of his team, O'Neill steals a Tollan device as they are departing back to Earth.
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02.18.99 New Ground
 The SG-1 team travels to a planet where, unbeknownst to them, the planet's two cultures have been at war over their opposed beliefs regarding the Stargate. Upon their arrival, they are met by the curious Nyan, a scientist who explains that their arrival proves that the beliefs of his rival culture, the Optricans, is true.
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02.25.99 Maternal Instinct
 Using the combined knowledge of Bra'tac, Daniel, and computer analysis, SG-1 finds the planet most likely to be "Kheb", of Jaffa and Goa'uld legend. Bra'tac and SG-1 travel to the planet in search of the Harsesis child, the child Apophis fathered with Sha're/Amaunet, in a race to find the child before Apophis.
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03.03.99 Crystal Skull
 Daniel Jackson becomes intrigued when the video transmission from the MALP reveals a huge Mayan pyramid with a glowing crystal skull in its center. He tells the rest of SG-1 and General Hammond that the skull appears to be identical to one his grandfather, Nicholas Ballard, found in Belize in 1971.
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03.10.99 Nemesis
 O'Neill is suddenly transported aboard Thor's ship, where he begins to hear a strange sound and moments later is faced with hundreds of menacing looking metallic bugs. He learns that these bugs are called replicators and are artificial organisms that have overtaken the ship and directed it toward Earth. (Part 1 of 2)