While Sam and Tealc go to the planet of the former human-form Replicators to contact the Asgard to cure Jack, Daniel and Dr. Weir must deal with Goauld System Lords who wish the Ancients weapon they used to destroy Anubis.
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Episodes: 20 | Released: 2004 | Certificate: PG | Genre: Sci-Fi/Fantasy | Director: Andy Mikita
Actors: Richard Dean Anderson , Christopher Judge , Don R Davis , Amanda Tapping , Anna Louise Plowman , David Palffy
As the Replicators overwhelm the new Asgard homeworld, SG-1 works to revive Jack, create an Ancients weapon to stop the invaders, and tries to find the missing Sam, who is held captive by the humanform Replicator Fifth in a virtual reality.
A Russian Air Force Colonel comes to join SGC, as an alien creature up at the same time. The creature starts taking over members of the SGC. General O'Neill orders SGC to be locked down until the creature can be contained.
Five days in the life of SGC as Jack assumes full command of the base and has to deal with a rapidly growing alien plant, the capture of SG1 by Ba'al, arguing alien delegates, and a tricky traitorous System Lord.
Daniel attempts to aid a battle-ravaged society when the team's appearance sparks a war.
The SGC experiment with a virtual reality chair from the Gamekeeper's world, but Teal'c becomes trapped in a virtual loop against an undefeatable batch of Anubis drones.
Teal'c moves into an apartment off-base where he becomes involved in a neighbor's problems. Meanwhile, Carter's boyfriend, Peter Shanahan, proposes and Carter tries to decide. Teal'c is then charged for murder and kidnapping. Daniel disappears while trying to prove Teal'c innocent.
A rich industrialist has evidence to prove that there is alien life on other planets and gives the governments of the world 24 hours to reveal the truth or he's revealing it.
Teal'c is upset when his son Rya'c plans to marry a Jaffa woman of the Haktyl who he sees as not fit for him. Ishta comes to the SGC after she believes Haktyl has been compromised, and moves her people into the SGC until Carter finds them a suitable planet. Ishta attends a meeting of Haktyl warriors to discuss rising against the Goa'uld Moloc.
The Trust is behind a plan to steal the Stargate and eliminate the Jaffa and the Goa'uld with the Tok'ra poison.
The Replicator Carter that Fifth created contacts the SGC and tells them that she wants to be destroyed. She also tells them that Fifth has made all Replicators immune to the disruptor. But does she have an ulterior motive?
General Hammond and Daniel go on an expedition on the Prometheus to Atlantis. They encounter an abandoned Goa'uld Al'kesh and decide to salvage it. A Kull warrior rings aboard the ship and rings everyone else onto the Al'kesh leaving only Daniel onboard the Prometheus. The Kull warrior turns out to be a woman named Vala who wants to use Prometheus to evacuate her people from a Goa'uld occupied world. But is she telling the truth?
The planet that Harry Maybourne was relocated to by the Tok'ra is targeted by a System Lord and SG-1 must go to rescue him. They discover that Harry has made himself king using knowledge of the Ancients knowledge that may give them access to the Ancients' time-travel technology.
Robert Kinsey contacts General O'Neill and tells him that the Trust is trying to bring down the U.S. government, and want Kinsey's help. Kinsey and the Trust escape surveillance but when the trail leads to Russia, Daniel is captured when it is revealed that Kinsey tried to kill a leading Russian general and Kinsey is now the host to a Goa'uld symbiote.
Jack is confronted in his home by an irate barber who claims to know everything about the Stargate project and SG-1.
The Replicators threaten to overwhelm the galaxy, taking out the Goa'uld and then Earth. While Sam and Thor work to develop a weapon, Teal'c and Bra'tac lead the rebel Jaffa in taking a major temple and Jack and Jacob are forced to make an alliance with Ba'al.
Ba'al sends his fleet back to retake the planet Dakara, pitting his ships against Teal'c and the Jaffa. The RepliCarter tries to probe Daniel's mind to find all the Ancients' knowledge, while Jacob and Carter discover the Ancient weapon on Dakara and try to figure out how to use it to destroy the Replicators. And on Earth, the Replicators overrun the SGC as Jack orders a nuclear strike.
While Daniel finds himself in a mysterious diner suspended between death and ascension, Jacob's fate takes an unexpected turn, Jack and Sam consider their romantic lives, and Anubis unleashes his plan for galactic destruction.
SG-1 and General O'Neill use the time-puddle jumper to go to Ancient Egypt to recover a ZPM. They successfully steal it but they find Jaffa surrounding the cloaked jumper. The future is altered and SG-1 never existed - Daniel teaches English as a second language, Carter proofreads astrophysics papers, and Jack retired from the Air Force and became a charter boat captain. Archaeologists find the video camera Daniel took with them with instructions to find the stargate, find Teal'c, and return to the past to correct the future.
The alternate SG-1 go to Chulak to find Teal'c and Daniel is killed. The alternate Carter, O'Neill, and Teal'c then go back to ancient Egypt to correct the past. They meet the original timeline Daniel who is the only survivor of a failed rebellion against Ra. Together, they must formulate a plan to steal the Stargate so that Ra can not take it with him.