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The SG-1 team extends a small time frame to several years to survive an attack of the Ori and tries to find a solution to solve their problem.
SG-1 gets caught in the middle when Ba'al and Adria compete for domination of the galaxy.
Vala's father Jacek contacts SGC claiming to have vital information that could impact the survival of Earth. Meanwhile, Gen. Landry's ex-wife pays a visit.
After a terrorist attack on a Jaffa summit leaves many dead and Bra'tac seriously injured, Teal'c goes on a one-man quest for revenge.
SG-1 finds an alien museum on another planet but are mistaken for a bunch of rebels that have taken hostages.
Col. Mitchell returns to Kansas to attend his high-school reunion with Vala when Stargate Command learns of an attack on SG-1 team members.
The SG-1 team learns of yet another world that has been visited by a Prior of the Ori. However, this Prior hasn't issued any threats. The team waits for the Prior's return, only to be shocked by his identity.
The Road Not Taken
Carter ends up in an alternate universe and changes the course of things in that universe.
Line in the Sand
Mitchell, Carter and Teal'c arrive on a planet being threatened by the Ori. They decide that a line needs to be drawn and that the Ori must not be allowed to advance any further. Carter attempts to use the Ancient Merlin's technology to prevent the Ori from taking over the planet.
The Quest: Part 2
The Quest: Part 1
The SG-1 team continues their quest for the Holy Grail, an Ancient device capable of killing the ascended Ori. They learn that an old nemesis is also looking for the device.
Company of Thieves
Mitchell attempts to infiltrate the Lucian Alliance in order to rescue members of the SG-1 team from the fallout of an Alliance civil war.
Vala finds herself alone in a city with no memory of her identity or past life. Meanwhile, Mitchell and Teal'c question a man named Weaver who may have information about Vala's whereabouts.
After Adria's followers on a planet are wiped out, she attempts to learn the location of this powerful new weapon.
Mitchell eagerly awaits the next off-world mission, which will be his 200th trip through the Stargate. However, Martin Lloyd returns and seeks help with his movie script. The Pentagon orders the SG-1 team to assist because the decision makers believe a film about intergalactic wormhole travel will provide a good cover story for the Stargate program.
While assisting SG-3 on an offworld mission, Teal'c encounters a savage alien creature that is killing the inhabitants. SG-1 investigates and learns that a parasite is to blame. The team suspects that the Ori are responsible, but they are shocked when they find out the real cause.
Stargate Command faces off against their old nemesis Ba'al and his clones as Landry spars with the NID and Agent Barrett.
The Pegasus Project
Daniel and Vala travel to Atlantis in search of Merlin's anti-Ori weapon, while Sam, and Mitchell join forces with Dr. McKay to lock out the Ori supergate.
The team goes off-world seeking a weapon against the Ori and ends up in serious trouble. Meanwhile, Landry is faced with having to decide whether or not Vala can be trusted to remain at the SGC.
Flesh and Blood
As the Ori gain power with their invasion of Chulak, Vala's daughter Adria ages years in a matter of hours and the secret of her conception is revealed.