Season 4
22 episodes · premiered Jun 30, 2000
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.
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E1 Small 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.
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E2 The Other Side
A warring alien race offers to exchange their advanced technology for Earth's help in defeating their enemy.
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E3 Upgrades
A Tok'ra archaeologist arrives at the SGC with newly discovered technology, giving the SG-1 team superhuman powers.
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E4 Crossroads
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.
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E5 Divide and Conquer
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.
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E6 Window of Opportunity
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.
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E7 Watergate
The Russians recover a Stargate from the bottom of the ocean, and turn to the SGC for help when their experiments go awry.
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E8 The First Ones
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.
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E9 Scorched Earth
SG-1 is caught in a conflict between two civilizations trying to colonize the same planet.
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E10 Beneath the Surface
The members of SG-1 are used as forced labor in an underground alien facility after their memories are erased by the ruling elite.
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E11 Point of No Return
SG-1 investigates a conspiracy theorist who has detailed knowledge of the Stargate program.
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E12 Tangent
A test gone wrong leaves Jack and Teal'c marooned in space aboard a damaged prototype attack ship
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E13 The Curse
When his former mentor dies, Dr. Jackson returns to his roots -- and discovers an ancient Egyptian artifact containing a Goa'uld parasite.
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E14 The Serpent's Venom
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.
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E15 Chain Reaction
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.
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E16 2010
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.
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E17 Absolute Power
Jackson's teammates notice a disturbing change in him when he is reunited with the Harcesis child and given the Goa'uld genetic memory.
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E18 The Light
SG-1 finds a deserted Goa'uld palace, where a beautiful device causes suicidal tendencies.
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E19 Prodigy
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.
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E20 Entity
The SGC is invaded by an alien life force that takes up residence in the base computer system -- and in Major Carter.
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E21 Double Jeopardy
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.
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E22 Exodus (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.