| Image | Title | Number | Airdate | Planet(s) | Race(s) | Enemies
|
 | "Enemies (Part 2 of 3)" | 501 | June 29, 2001 | Delmak, Earth | Goa'uld, Replicator, Tok'ra | Apophis, Teal'c, Replicators
|
| The supernova causes SG-1 and Apophis' ships to jump 4 million light years. SG-1 hides from Apophis, but after coming out again, they find Apophis' ship completely abandoned. It is discovered Apophis and his Jaffa fled the ship after it is taken over by Replicators. They infest the Ha'tak, and furthermore, Apophis has brainwashed Teal'c, and is now working against his team.
|
 | "Threshold (Part 3 of 3)" | 502 | July 6, 2001 | Chulak, Earth | Jaffa | N/A
|
| Even after Apophis' death, Teal'c is still brainwashed. The only way to break the brainwash is the Rite of M'al Sharran, a ceremony in which their symbiote is removed until the Jaffa makes his or her choice whether they are to die free, or a slave.
|
 | "Ascension" | 503 | July 13, 2001 | Earth, Velona | Ancient | N/A
|
| After a mission to Velona, where they find a weapon capable of defeating the Goa'uld, Samantha Carter is followed by an ascended being named Orlin, who warns her not to use the weapon.
|
 | "The Fifth Man" | 504 | July 20, 2001 | Earth, P7S-441 | Jaffa, Reol | Jaffa
|
| SG-1 is forced to abandon Jack O'Neill and the team's fifth member, Lt. Tyler. However, before they can reinforce themselves, they are stopped and pulled off duty, since the SGC has no recollection of Tyler. Meanwhile, O'Neill and "Tyler" hide from Jaffa patrols.
|
 | "Red Sky" | 505 | July 27, 2001 | Earth, K'tau | Asgard, K'Tau | N/A
|
| A mission to K'tau, causes the planet's sun to die out, after the wormhole travelled through it, causing it to be unstable. The Asgard, who protects the planet isn't allowed to intervene, so the Tau'ri is forced to help them themselves, but some of the natives won't allow it.
|
 | "Rite of Passage" | 506 | August 3, 2001 | Earth | Hankan | Nirrti
|
| On her sixteenth birthday, Cassandra falls ill. Soon, they learn that when she was younger, Nirrti experimented on her and other children like her. They have to save her before she will die.
|
 | "Beast of Burden" | 507 | August 10, 2001 | Burrock's World, Earth, P3X-888 | Unas | Burrock
|
| Chaka and other Unas are kidnapped and sold as servents on another planet. While SG-1 observes, Jackson and O'Neill are captured, and Carter and Teal'c plan to break them out.
|
 | "The Tomb" | 508 | August 17, 2001 | Earth, P2X-338 | Goa'uld | Marduk
|
| After a team from the Russian Stargate Programme is missing on P2X-338, SG-1 and another Russian team is sent to retrieve them. In their search, they find a mysterious tomb, which housed a deadly enemy, picking off the Russian team members one by one.
|
 | "Between Two Fires" | 509 | August 24, 2001 | Earth, Tollana | Goa'uld, Tollan | Tanith
|
| The Tollans are somehow willing to give away their Ion cannons to the Tau'ri to protect Earth. Omoc died, and Narim believes he was murdered, which did not happen to the Tollans for several years. SG-1 comes to the conclusion that those two events are connected somehow, and a conspiracy is brewing. They soon find that Travell actually works for Tanith.
|
 | "2001" | 510 | August 31, 2001 | Earth, Volia | Aschen, Volian | Aschen
|
| SG-1 makes contact with a technologically advanced race known as the Aschen (a race of people SG-1 from an alternate future tried to warn current SG-1 not to make contact with). While they form an alliance, Jackson and Teal'c find clues about the Aschen past.
|
 | "Desperate Measures" | 511 | September 7, 2001 | Earth | N/A | Adrian Conrad, Frank Simmons
|
| Samantha Carter is kidnapped by masked assailants, who also took a symbiote from the Russians. The rest of SG-1 do all they can to find her. Meanwhile, she finds out who is responsible for her kidnapping, Adrian Conrad, who is dying wants to experiment on her, so he can take a symbiote to cure him of all illness, and then remove it safely.
|
 | "Wormhole X-Treme!" | 512 | September 8, 2001 | Earth, Mars | N/A | Peter Tanner
|
| SG-1 watches a television commercial about a new sci-fi show called "Wormhole X-Treme!", which has very similar attributes to the Stargate Programme. While O'Neill investigates, he learns that Martin Lloyd pitched the idea of the show to the studio.
|
 | "Proving Ground" | 513 | March 8, 2002 | Earth | N/A | N/A
|
| SG-1 is training a group of recruits to prove test their limits when joining an SG team. Training doesn't go very well, so O'Neill plans to motivate them.
|
 | "48 Hours" | 514 | March 15, 2002 | Earth, Memphis | Goa'uld | Tanith, Adrian Conrad, Frank Simmons
|
| After escaping the Goa'uld, and killing Tanith, the Stargate shuts down just as Teal'c is still in the wormhole. Their efforts to halt the Stargate Programme are threatened, when Franks Simmons of the NID gives them a 48 hour deadline to save him, or the Stargate Programme will continue, and Teal'c will die.
|
 | "Summit (Part 1 of 2)" | 515 | March 22, 2002 | Earth, Revanna | Goa'uld, Tok'ra | Ba'al, Osiris, Zipacna
|
| The Tok'ra ask Daniel Jackson to covertly spy on a summit between all system lords, so the Tok'ra can kill them, but learns that a new system lord is to join them, one long thought to be dead.
|
 | "Last Stand (Part 2 of 2)" | 516 | March 29, 2002 | Revanna | Goa'uld, Tok'ra | Ba'al, Osiris, Zipacna
|
| While Daniel Jackson learns the identity of ruthless system lord Anubis, who commited attrocities that even the Goa'uld find horrifying, his plans to rescue Sarah Gardner could blow his cover. Meanwhile, Zipacna sent his Jaffa to attack the Tok'ra base on Revanna.
|
 | "Fail Safe" | 517 | April 5, 2002 | Earth, Revanna | Asgard, Tok'ra | N/A
|
| An asteroid is on a collision course for Earth. The Asgard can't help, and the Tok'ra are hard to find, so they return to Revanna to repair a Tel'tak, so SG-1 could deliver a nuclear bomb to destroy it. However, they soon learn that the asteroid may not be natural in origin.
|
 | "The Warrior" | 518 | April 12, 2002 | Yu's homeworld | Jaffa | K'tano/Imhotep
|
| SG-1, especially Teal'c join a camp full of rebel Jaffa, led by K'tano, who wish to stop the Goa'uld, and have more Jaffa join their rebellion. Teal'c decides to change his allegiance to his people, and the rest of the team suspect that K'tano, the former first prime of Imhotep, is hiding something from them.
|
 | "Menace" | 519 | April 26, 2002 | Earth, Reese's World | Replicator | Reese, Replicators
|
| SG-1 finds Reese the last of her people on her home planet. They take her back and soon learn that she is an android. Furthermore, she can create Replicators, and they soon become a serious threat to Stargate Command.
|
 | "The Sentinel" | 520 | May 3, 2002 | Jaffa, Latona | Jaffa, Latonan | Svarog
|
| The Goa'uld system lord, Svarog is planning on taking back Latona to his control. The only way to stop his is the Sentinel, a piece of technology capable of defeating him. Unfortunately, rogue NID agents once tampered with the device, and SG-1 gets the ones responsible to make it operational again.
|
 | "Meridian" | 521 | May 10, 2002 | Earth, Langara | Langaran | N/A
|
| SG-1 have discovered that the Langarans have naquadria, a more volatile version of naquadah, and they plan to use it as a weapon, since the planet's three nations are on the verge of war. Daniel Jackson prevents an accident, but is stricken with radiation poisoning in the process, and will die if they don't save him in time.
|
 | "Revelations" | 522 | May 17, 2002 | Adara II, Earth | Asgard, Goa'uld | Anubis, Osiris
|
| Following the loss of Daniel Jackson, Anubis has made his fleet immune to Asgard defenses, and he has captured Thor. SG-1 must assist Heimdall to evacuate all Asgard knowledge from Adara II, before Anubis gets his hands on them.
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