Season 4

2000 · 22 episodes

O'Neill and Teal'c risk their lives to keep the Replicator bugs from gaining a foothold on Earth, while Carter helps the Asgard fend off a Replicator invasion. A warring alien race offers to exchange their advanced technology for Earth's help in defeating their enemy.

1Small Victories (2)O'Neill and Teal'c risk their lives to keep the Replicator bugs from gaining a foothold on Earth, while Carter helps the Asgard fend off a Replicator invasion.
2The Other SideA warring alien race offers to exchange their advanced technology for Earth's help in defeating their enemy.
3UpgradesA Tok'ra archaeologist arrives at the SGC with newly discovered technology, giving the SG-1 team superhuman powers.
4CrossroadsTeal'c is reunited with his lost love -- a woman who claims to have found a way to communicate with her symbiote and defeat the Goa'uld.
5Divide and ConquerWhen a member of the SGC tries to kill a Tok'ra, it is revealed that O'Neill and Carter may be victims of an untraceable form of Goa'uld mind control.
6Window of OpportunityO'Neill and Teal'c are caught in a time loop in the SGC, and must relive the same 10 hours over and over again.
7WatergateThe Russians recover a Stargate from the bottom of the ocean, and turn to the SGC for help when their experiments go awry.
8The First OnesDr. Jackson is taken captive by an Unas while on an archaeological dig. The SGC mounts a rescue operation, but discovers a danger of their own.
9Scorched EarthSG-1 is caught in a conflict between two civilizations trying to colonize the same planet.
10Beneath the SurfaceThe members of SG-1 are used as forced labor in an underground alien facility after their memories are erased by the ruling elite.
11Point of No ReturnSG-1 investigates a conspiracy theorist who has detailed knowledge of the Stargate program.
12TangentA test gone wrong leaves Jack and Teal'c marooned in space aboard a damaged prototype attack ship
13The CurseWhen his former mentor dies, Dr. Jackson returns to his roots -- and discovers an ancient Egyptian artifact containing a Goa'uld parasite.
14The Serpent's VenomSG-1 must stop Apophis and Heru-ur from forming an alliance of their powerful forces, while Teal'c is captured and tortured by the Goa'uld.
15Chain ReactionSG-1 must adjust to a new commanding officer when General Hammond steps down -- but O'Neill discovers foul play behind the general's resignation.
162010Ten years into the future, the former members of SG-1 must send a message into the past to prevent the extinction of the human race.
17Absolute PowerJackson's teammates notice a disturbing change in him when he is reunited with the Harcesis child and given the Goa'uld genetic memory.
18The LightSG-1 finds a deserted Goa'uld palace, where a beautiful device causes suicidal tendencies.
19ProdigyCarter must help keep a promising young cadet from throwing away a future at the SGC. O'Neill and Teal'c encounter a dangerous life form at an offworld research base.
20EntityThe SGC is invaded by an alien life force that takes up residence in the base computer system -- and in Major Carter.
21Double JeopardySG-1 must rescue an alien world from the Goa'uld -- with help from an unexpected source. Teal'c seeks revenge on the System Lord Cronus for the murder of his father.
22Exodus (1)SG-1 helps to evacuate the Tok'ra to a new base -- but matters are complicated when a spy reveals their location to Apophis. The team attempts a daring plan to take out the Goa'uld's powerful fleet.

Episodes