| Image
| Title
| Number
| Airdate
| Planet(s)
| Race(s)
| Enemies
|
| "Enemies" (Part 3 of 4)
| 501
| June 29, 2001
| Delmak, Earth
| Goa'uld, Replicator, Tok'ra
| Apophis, Teal'c, Replicators
|
| The supernova causes SG-1 to be hurtled 4 million light years to another galaxy only to be followed by Apophis with no quick way to get back home. Things get worse when an very powerful enemy makes an appearance.
|
| "Threshold" (Part 4 of 4)
| 502
| July 6, 2001
| Chulak, Earth
| Jaffa
| N/A
|
| Apophis' brainwashing of Teal'c appears to be incurable until Bra'tac arrives and removes Teal'c symbiote. During this Teal'c begins to dream about he begun to believe the Goa'uld were not gods.
|
| "Ascension"
| 503
| July 13, 2001
| Earth, Velona
| Ancient
| N/A
|
| During a mission to Velona Carter collapses. Back on Earth she is visited by a man who claims to be an ascended Ancient who has fallen in love with her.
|
| "The Fifth Man"
| 504
| July 20, 2001
| Earth, P7S-441
| Jaffa, Reol
| Jaffa
|
| SG-1 is forced to leave O'Neill on another planet with the fifth member of SG-1, Lt. Tyler and return to the SGC, only to discover that no one else knows who Lt. Tyler is.
|
| "Red Sky"
| 505
| July 27, 2001
| Earth, K'tau
| Asgard, K'Tau
| N/A
|
| On the planet K'tau, SG-1 inadvertently introduces a foreign element into the planets sun causing it to slowly begin to die. The contact the Asgard to help but they are powerless to interfere as it is a protected planet.
|
| "Rite of Passage"
| 506
| August 3, 2001
| Earth
| Hankan
| Nirrti
|
| On her 16th birthday, Cassandra begins to fall ill. It is discovered that her DNA was manipulated by Nirrti in an attempt to create a perfect host and she has come to the SGC looking for her.
|
| "Beast of Burden"
| 507
| August 10, 2001
| Burrock's World, Earth, P3X-888
| Burrock's people, Unas
| Burrock
|
| Chaka is captured by humans who use Unas as slaves. SG-1 go after him and are captured trying to free Chaka and the other Unas.
|
| "The Tomb"
| 508
| August 17, 2001
| Earth, P2X-338
| Goa'uld
| Marduk
|
| The SGC discover evidence of a missing Russian team on a planet and team up with another team from Russia in an attempt to locate them and the mysterious artifact they were searching for.
|
| "Between Two Fires"
| 509
| August 24, 2001
| Earth, Tollana
| Goa'uld, Tollan
| Tanith
|
| The Tollan suddenly decide to give Earth weaponry in exchange for Trinium. A secret message from Narim leaves SG-1 believing in a conspiracy among the Tollan. It is soon discovered that they are under the control of the Goa'uld.
|
| "2001"
| 510
| August 31, 2001
| Earth, Volia
| Aschen, Volian
| Aschen
|
| SG-1 makes contact with the technologically advanced Aschen but soon have reason to believe they are not who they are claiming to be after some mysterious buildings are found underground.
|
| "Desperate Measures"
| 511
| September 7, 2001
| Earth
| N/A
| Adrian Conrad, Frank Simmons
|
| Carter is kidnapped by a man who wants her help in understanding how to safely remove a Goa'uld symbiote and she soon discovers that he is in possession of a real symbiote and plans to implant himself to save himself from a disease.
|
| "Wormhole X-Treme!"
| 512
| September 8, 2001
| Earth, Mars
| Martin's people
| Peter Tanner
|
| SG-1 watches a television commercial concerning a new sci-fi television show that bears a striking resemblance to the SGC and SG-1. O'Neill goes undercover at the studio to talk to the creator Martin Lloyd.
|
| "Proving Ground"
| 513
| March 8, 2002
| Earth
| N/A
| N/A
|
| SG-1 begins training new SGC cadets in various techniques regarding offworld combat. These cadets soon discover that the SGC has come under control of an alien device and O'Neill is forced to recruit these cadets to help him take back the base.
|
| "48 Hours"
| 514
| March 15, 2002
| Earth, Memphis
| Goa'uld
| Tanith, Adrian Conrad, Frank Simmons
|
| The Stargate shuts down while Teal'c is in transit and they believe he perished in the wormhole. The Pentagon gives them 48 hours to figure out how to get him out or resume offworld missions and lose him forever.
|
| "Summit" (Part 1 of 2)
| 515
| March 22, 2002
| Earth, Revanna
| Goa'uld, Tok'ra
| Ba'al, Osiris, Zipacna
|
| Daniel Jackson goes undercover among the system lords in a Tok'ra plot to take out the system lords only to discover that Sarah Gardener/Osiris is there offering the bid of Anubis to rejoin the system lords.
|
| "Last Stand" (Part 2 of 2)
| 516
| March 29, 2002
| Revanna
| Goa'uld, Tok'ra
| Ba'al, Osiris, Zipacna
|
| The Goa'uld launch an attack on the Tok'ra base of Revanna while Daniel attempts to kidnapp Sarah and free her from Osiris' control.
|
| "Fail Safe"
| 517
| April 5, 2002
| Earth, Revanna
| Asgard, Tok'ra
| N/A
|
| It is discovered that a meteor is on its way to Earth and will destroy all life on the planet. With the Asgard refusing to help them, SG-1 fixes a crashed cargo ship and attempt to fly to the meteor and destroy it with a nuclear weapon only to find out that the meteor was sent there by the Goa'uld.
|
| "The Warrior"
| 518
| April 12, 2002
| Yu's homeworld
| Jaffa
| K'tano/Imhotep
|
| SG-1 travel to Kel Mah to meet with the new leader of the Jaffa rebellion, K'tano and offer their help, however they are disturbed at his methods of attacking the Goa'uld.
|
| "Menace"
| 519
| April 26, 2002
| Earth, Reese's World
| Replicator
| Reese, Replicators
|
| SG-1 find a deactivate android on a world destroyed by the Replicators. Upon activation the android claims to be human and it is discovered that she was responsible for the creation of the Replicators.
|
| "The Sentinel"
| 520
| May 3, 2002
| Jaffa, Latona
| Jaffa, Latonan
| Svarog
|
| SG-1 travel to Latona with two N.I.D criminals in an attempt to repair a device, which would free the people from the Goa'uld, who these N.I.D criminals damaged in the first place.
|
| "Meridian"
| 521
| May 10, 2002
| Earth, Langara
| Langaran
| N/A
|
| SG-1 find a planet where the people are experimenting with a variation of Naquadah called Naquadria and were testing a bomb. Daniel Jackson risks his own life to disable a bomb that will kill thousands only to be dosed with radiation. Near death he is visited by an ascended being.
|
| "Revelations"
| 522
| May 17, 2002
| Adara II, Earth
| Asgard, Goa'uld
| Anubis, Osiris
|
| SG-1 travel to a planet in the Milky Way to help evacuate an Asgard scientist and find out that Thor has been captured by the Goa'uld and Anubis is on his way to interrogate him.
|
