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.
All episodes — Season 4
S4 E1Small Victories (2)
Jun 30, 20007.944 min
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.
S4 E2The Other Side
Jul 7, 20007.744 min
A warring alien race offers to exchange their advanced technology for Earth's help in defeating their enemy.
S4 E3Upgrades
Jul 14, 20008.544 min
A Tok'ra archaeologist arrives at the SGC with newly discovered technology, giving the SG-1 team superhuman powers.
S4 E4Crossroads
Jul 21, 20007.244 min
Teal'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.
S4 E5Divide and Conquer
Jul 28, 20008.244 min
When 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.
S4 E6Window of Opportunity
Aug 4, 20009.344 min
O'Neill and Teal'c are caught in a time loop in the SGC, and must relive the same 10 hours over and over again.
S4 E7Watergate
Aug 11, 20007.444 min
The Russians recover a Stargate from the bottom of the ocean, and turn to the SGC for help when their experiments go awry.
S4 E8The First Ones
Aug 18, 20007.544 min
Dr. 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.
S4 E9Scorched Earth
Aug 25, 20007.344 min
SG-1 is caught in a conflict between two civilizations trying to colonize the same planet.
S4 E10Beneath the Surface
Sep 1, 20007.344 min
The members of SG-1 are used as forced labor in an underground alien facility after their memories are erased by the ruling elite.
S4 E11Point of No Return
Sep 8, 20006.944 min
SG-1 investigates a conspiracy theorist who has detailed knowledge of the Stargate program.
S4 E12Tangent
Sep 15, 20007.644 min
A test gone wrong leaves Jack and Teal'c marooned in space aboard a damaged prototype attack ship
S4 E13The Curse
Sep 22, 20007.344 min
When his former mentor dies, Dr. Jackson returns to his roots -- and discovers an ancient Egyptian artifact containing a Goa'uld parasite.
S4 E14The Serpent's Venom
Sep 29, 20007.544 min
SG-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.
S4 E15Chain Reaction
Jan 5, 2001844 min
SG-1 must adjust to a new commanding officer when General Hammond steps down -- but O'Neill discovers foul play behind the general's resignation.
S4 E162010
Jan 12, 20018.244 min
Ten 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.
S4 E17Absolute Power
Jan 19, 20017.544 min
Jackson's teammates notice a disturbing change in him when he is reunited with the Harcesis child and given the Goa'uld genetic memory.
S4 E18The Light
Jan 26, 2001744 min
SG-1 finds a deserted Goa'uld palace, where a beautiful device causes suicidal tendencies.
S4 E19Prodigy
Feb 2, 20017.244 min
Carter 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.
S4 E20Entity
Feb 9, 20016.944 min
The SGC is invaded by an alien life force that takes up residence in the base computer system -- and in Major Carter.
S4 E21Double Jeopardy
Feb 16, 20017.644 min
SG-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.
S4 E22Exodus (1)
Feb 23, 20018.144 min
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.