SG-1 Season Four Episode Guide

Small Victories
EPISODE #: 401     AIR DATE: 06.30.00     
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.
The Other Side
EPISODE #: 402     AIR DATE: 07.07.00     
A warring alien race offers to exchange their advanced technology for Earth's help in defeating their enemy.
Upgrades
EPISODE #: 403     AIR DATE: 07.14.00     
A Tok'ra archaeologist arrives at the S.G.C. with newly discovered technology, giving the SG-1 team superhuman powers.
Crossroads
EPISODE #: 404     AIR DATE: 07.21.00     
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.
Divide and Conquer
EPISODE #: 405     AIR DATE: 07.28.00     
When a member of the S.G.C. 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.
Window of Opportunity
EPISODE #: 406     AIR DATE: 08.04.00     
O'Neill and Teal'c are caught in a time loop in the S.G.C., and must relive the same 10 hours over and over again.
Watergate
EPISODE #: 407     AIR DATE: 08.11.00     
The Russians recover a Stargate from the bottom of the ocean, and turn to the S.G.C. for help when their experiments go awry.
The First Ones
EPISODE #: 408     AIR DATE: 08.18.00     
After Dr. Jackson is taken captive by an Unas while on an archaeological dig, the S.G.C. mounts a rescue operation -- but discovers a danger of their own.
Scorched Earth
EPISODE #: 409     AIR DATE: 08.25.00     
SG-1 is caught in a conflict between two civilizations trying to colonize the same planet.
Beneath the Surface
EPISODE #: 410     AIR DATE: 09.01.00     
The members of SG-1 are used as forced labor in an underground alien facility after their memories are erased by the ruling elite.
Point of No Return
EPISODE #: 411     AIR DATE: 09.08.00     
SG-1 investigates a conspiracy theorist who has detailed knowledge of the Stargate program.
Tangent
EPISODE #: 412     AIR DATE: 09.15.00     
A test gone wrong leaves Jack and Teal'c marooned in space aboard a damaged prototype attack ship.
The Curse
EPISODE #: 413     AIR DATE: 09.22.00     
When his former mentor dies, Dr. Jackson returns to his roots -- and discovers an ancient Egyptian artifact containing a Goa'uld parasite.
The Serpent's Venom
EPISODE #: 414     AIR DATE: 09.29.00     
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.
Chain Reaction
EPISODE #: 415     AIR DATE: 01.05.01     
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.
2010
EPISODE #: 416     AIR DATE: 01.12.01     
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.
Absolute Power
EPISODE #: 417     AIR DATE: 01.19.01     
Jackson's teammates notice a disturbing change in him when he is reunited with the Harcesis child and given the Goa'uld genetic memory.
The Light
EPISODE #: 418     AIR DATE: 01.26.01     
SG-1 finds a deserted Goa'uld palace, where a beautiful device causes suicidal tendencies.
Prodigy
EPISODE #: 419     AIR DATE: 02.02.01     
Carter must help keep a promising young cadet from throwing away a future at the S.G.C. O'Neill and Teal'c encounter a dangerous life form at an offworld research base.
Entity
EPISODE #: 420     AIR DATE: 02.09.01     
The S.G.C. is invaded by an alien life force that takes up residence in the base computer system -- and in Major Carter.
Double Jeopardy
EPISODE #: 421     AIR DATE: 02.16.01     
SG-1 joins forces with their robot doubles to rescue an alien world from the Goa'uld Cronus, while Teal'c seeks revenge for the murder of his father.
Exodus
EPISODE #: 422     AIR DATE: 02.23.01     
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.