Stargate SG1 season 3 offers 22 episodes. I’ve done my best to avoid spoilers, but the very premise of an episode may give away the ending of one that came before it. The season premier, in particular, will give away some secrets of the end of the previous season.
1) Into The Fire
SG1 is the prisoner of Hathor. Other teams are attempting rescue off Tok’ra information, and Teal’c has resigned his position to return to his home world to raise his own rescue team. It’s too late. Jack is infected with a Goa’uld.
-This follow up episode is far more exciting than the previous one. It’s still not as good as the season 2 premier, though.
2) Seth
Jacob thinks an evil Goa’uld may be hiding out on Earth. SG1 tracks a suspect cult leader, but they have to work with the ATF already watching the guy without revealing what is really going on or their suspicions of who he really is. To further complicate matters in order to take him down the team must first allow him to take control of their minds.
-Like I've said before, the Goa’ulds on Earth start feeling overused. This isn’t a bad episode, it just makes me wonder how many of these guys can be hiding out on Earth.
3) Fair Game
The Goa’uld are about to wipe out Earth, and Thor offers assistance. Jack trusts him, but the Earth leaders don’t know him and don’t like the idea of the system lords coming to Earth to negotiate a treaty even with Thor's assurance of protection. With tensions already high Teal’c is accused of trying to kill one of the Goa’uld which leads the others to threaten retaliation.
4) Legacy
SG1 finds an old building full of Goa’uld cadavers in a sealed room. What could have possibly killed them? Shortly thereafter Daniel starts hearing voices. When he starts seeing creepy visions as well he gets worried. Is gate travel affecting his mind like the sarcophagus? To make matters worse, now Teal’c is dying for no discernible reason.
5) Learning Curve
SG1 finds an advanced race and they make fast friends. The kids here are unusually smart. They turn out to have a system of learning that the Tau’ri find disturbing. But does SG1 have any right to interfere with the ways of a sovereign society just because their ways are different?
6) Point Of View
Daniel’s quantum mirror is activated from the other side by another Sam and still living Kawalsky. As realities cross again they soon realize that two Sams cannot coexist in the same reality. They have to get the other Sam back, but she might not have an Earth to go back to. SG1 mounts an offensive to help their alternate selves.
7) Deadman Switch
SG1 find themselves at the mercy of a bounty hunter. Their only bargaining power is their ability to help him hunt down a Goa’uld with a price on his head. They try to prick the hunter’s humanity, but he doesn’t seem to have any left.
8) Demons
SG1 finds signs of Christianity. Off-world Catholics? The scared and sick villagers are controlled by a Goa’uld Satan and an iron-fisted spiritual leader drunk on his own power. He plans to stop SG1's interference by turning innocent villagers against them.
9) Rules Of Engagement
SG1 stumbles across another SG team under fire. When SG1 offers help they are gunned down. They find themselves in a training camp in the middle of wargames set up by Apophis. SG1 may have a hard enough time saving themselves much less the band of kids on the verge of slaughtering themselves.
10) Forever In A Day
In the middle of a fierce battle Daniel finds his wife who promptly attacks him. Teal’c feels he must kill her to save Daniel, but the man cannot suffer the death of his wife.
-This is a major episode in the development of Daniel’s character. His whole motivation and outlooks change in ways that affect the rest of the series. It’s a touching episode.
11) Past & Present
SG1 finds a civilization with a collective memory that cuts off little more than a year previous. Their elderly and their young are suspiciously missing. SG1 comes to suspect the work of an old would-be friend. Daniel finds himself on the cusp of a potential romance but doesn’t really know how to deal with a romantic interest at this stage in his life.
12) Jolinar's Memories
Jacob has been captured by Sokar, the Goa’uld posing as Satan. Only Jolinar (the Tok'ra who fled into Sam previously) managed to escape from Sokar’s manufactured “Hell” so Martouf wants to pick Sam’s mind for Jolinar’s memories. The problem is Jolinar withheld information deliberately making it enormously painful to recover them from Sam's mind. SG1 and the Tok’ra mount a joint rescue operation hoping they can literally escape from Hell.
13) The Devil You Know
In a continuation of the previous episode SG1, Jacob, and Martouf are imprisoned in Hell, or the Goa’uld version of it. Escape attempts have been thwarted and are further complicated by the reemergence of an old enemy.
14) Foothold
Teal’c and Sam believe SG Command has been compromised by aliens posing as their colleagues. They mount an escape and rescue seeking help from an unlikely source, Maybourne. He is not so quick to believe their story, though, especially when Jack and Daniel show up to let them know of a chemical spill that has affected Sam’s mind. Who is telling the truth?
15) Pretense
A space battle leaves Skaara injured and in the hands of the Tollan. They hold a trial to determine if Skaara or the Goa’uld within him holds greater claim to use of this body. Skaara wishes SG1 to be his defenders, but the Goa’uld gets a defense also. The Goa’uld entourage may be up to a work of sabotage, but the Tollan are so sure of their superiority that they disregard Jack’s warning. Their overconfidence may well be their downfall.
16) Urgo
SG1 finds an uncharted paradise, but when they go there they mysteriously lose 15 hours. As they try to find out what happened they find implants in their brains that cause them to see and hear the pestering persona of Urgo.
-Dom DeLuise is Urgo. He makes this a fun, if goofy, episode.
17) A Hundred Days
A beautiful but dangerously close meteor shower has SG1 concerned for their newfound friends. Contention and stubbornness result in some of the villagers refusing to be evacuated, and while trying to save them Jack is unable to make it to the stargate. Jack and many others survive, but they find that the stargate is now gone. Trapped with a beautiful woman, fishing, and no one trying to kill him, this life might not be so bad compared to having to save the universe all the time.
18) Shades Of Grey
SG1 pleads for technology from the Tollan. When refused yet again Jack decides to take some anyway. The team is appalled but can’t stop him. He then crosses the line with Hammond, justifying his actions until he is relieved of command. Alien influence doesn’t explain it this time, he’s just snapped. The NID might be his only way back into the world of gate travel. But can he really bring himself to work with Maybourne?
19) New Ground
SG Command connects to a stargate that was previously buried. When they travel there they make fast friends with the archaeologist who uncovered the gate, but they also create panic in others. The truth of SG1’s travel and origins upsets the religious beliefs of a culture that is willing to torture and kill to protect the assertion that gate travel does not exist. Everyone but Teal’c is taken hostage, but he is blinded by the battle and lost in the woods, not a big help for a rescue operation.
20) Maternal Instinct
Bra’tac comes to Earth with troubling news: Apophis is searching for his son and willing to destroy anyone and everyone in his path to find the child. Bra’tac’s knowledge may help Daniel get ahead of SG1's nemesis, but what they find will beat everything they’ve seen before.
-This continues the Harcesis story arc. It’s one of the more unusual episodes, but is arguably the best one this season.
21) Crystal Skull
SG1 finds a huge, old pyramid. Inside is a crystal skull that matches one Daniel’s grandfather found on Earth. When Daniel looks into the skull he is rendered invisible and unable to communicate. The others are oblivious to his plight and set out to find him turning to the only person who may have any insight, Daniel’s grandfather who is currently housed in a mental institution.
22) Nemesis
Thor calls Jack aboard his ship to help with a problem, Replicators are tearing his vessel apart and killing him. Thor reveals that Jack must stop the Replicators in order to save Earth, but there is no way to save both his planet and himself.
-This is the introduction of the Replicators, a dangerous and fascinating foe that will plague SG1 for years to come.