An Air Force pilot attempts to reassemble SG-1 after they have gone their separate ways. An old "friend" arrives on Earth asking for Daniel's help in finding an ancient treasure -- and she won't take no for an answer.

An Ancient communications device renders Daniel and Vala unconscious, sending their minds to another galaxy -- where they inhabit the bodies of two people persecuted by the followers of an evil religion.

Daniel comes face to face with the Ori, a fiery race of beings who demand the worship of mortals. Elsewhere, Stargate Command encounters the first Ori missionary in our galaxy.

Jackson and Mitchell must join Vala on an interplanetary scavenger hunt when they learn that they are still bound together by an alien energy field.

SG-1 visits a world whose people once worshipped Vala as a god -- and demand that she stand trial when she confesses to manipulating them.

Samantha Carter returns to Stargate Command when the Ori seize control of a planet, using an expanding force field to gain a foothold in our galaxy.

SG-1 investigates when evidence suggests that there are still Goa'uld hiding on Earth -- including a former System Lord. Tensions between Earth and the Free Jaffa continue to mount.

Colonel Mitchell is injured in a skirmish with a warrior from a mythic tribe of rebel Jaffa, and is trained in their fighting techniques only so that he may engage in a ritual battle to the death.

SG-1 finds a genetically advanced Goa'uld-human hybrid created by Anubis, and returns him to Earth for study. But even keeping him alive may not be worth the risk.

Earth is infected with a deadly Ori plague, prompting an ally from SG-1's past to come to their aid. Gerak proposes that the Free Jaffa follow the Ori religion.

As the Ori plague spreads rapidly, SG-1 hopes that the Prior who caused the disease may hold the key to its cure. Gerak tries to rally the Jaffa to the Ori's cause, prompting Teal'c and Bra'tac to initiate a resistance.

When SG-1 travels to an Asgard Protected Planet, Colonel Mitchell is accused of a murder he did not commit.

Multiple SG-1s show up at Stargate Command, leading the "real" team to conclude that they have each been inadvertantly displaced from different parallel realities.

Baal kidnaps Teal'c as part of a plot to brainwash those Jaffa advocating a move toward democracy. Cameron Mitchell learns that an old friend is about to die.

Daniel is imprisoned on a world under the influence of the Ori, and the Prometheus is caught in a firefight when SG-1 tries to rescue him.

SG-1 is captured after a deal with the Lucian Alliance goes bad ... and the planet's Stargate goes missing. Meanwhile, a former System Lord attempts to rebuild his empire.

A tour of an off-world research base for a group of foreign diplomats turns dangerous when an insidious insect species gets loose.

Mitchell and Carter are shifted to another dimension, making them invisible to everyone at the S.G.C. Meanwhile, Teal'c and SG-9 discover that the Sodan have been brutally attacked.

Vala Mal Doran makes contact with Stargate Command from the Ori home galaxy, and tells the story of her life undercover in a village of followers building the Ori's invasion fleet.

SG-1 discovers the village of Camelot on an alien world, and must face Merlin's security system when they go in search of an Ancient weapon. Elsewhere, Earth and its allies assemble a fleet when a working Ori Supergate is discovered.

As the Ori invade the Jaffa planet Chulak, Vala and Daniel must deal with their leader: Vala's young daughter, rapidly aged by the Ori to serve their purposes.

SG-1 investigates a problem off-world and soon finds that they have become victims themselves: they cannot stay awake. Meanwhile, Vala Mal Doran undergoes an evaluation on Earth, hoping to join SG-1.

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.

When Ba'al comes to Earth seeking help, Stargate Command must capture his clones and determine which one is the genuine article.

Teal'c discovers a world where people are being savagely attacked by an elusive creature, leading SG-1 to a stunning discovery about its potential origin.

Martin Lloyd seeks out SG-1 for assistance when his failed TV show based on the real Stargate program becomes a feature film.

The Jaffa take the fight to the Ori, using a genocidal weapon on their new worshipers and landing SG-1 in the middle of a war they can't control.

Stricken with amnesia and on the run, Vala takes a job as a waitress as she tries to piece together who she is and what happened to her.

Cameron Mitchell must go undercover inside the deadly Lucian Alliance to prevent his teammates from becoming casualties of an Alliance civil war.

SG-1 races against Baal in the hunt to find the Sangraal, Merlin's anti-Ori weapon, and comes up against a series of ancient trials.

When the team finds Merlin himself, they must help him complete the Sangraal weapon before Adria and her Ori forces can track them down.

SG-1 tries to defend a planet from the Ori by hiding its people in another dimension. Vala attempts to convince her husband Tomin of the Ori's true motives.

An experiment gone wrong pulls Samantha Carter into a parallel reality, where she must save Earth from an Ori assault before she will be allowed to return home.

When SG-1 discovers that Daniel Jackson has been turned into a Prior of the Ori, they must determine whether or not his plan to destroy the Ori is genuine.

When the Lucian Alliance puts a bounty on SG-1's heads, Cameron Mitchell finds himself a target while attending his high school reunion.

SG-1 realizes they have stepped through the gate into another planet's museum -- but are mistaken for a band of zealous rebels who have taken hostages.

When a terrorist attack decimates a Jaffa summit Teal'c strikes out on a quest for revenge, believing that the perpetrator is one of his own pupils.

Earth provides sanctuary for Vala's estranged, con artist father after he provides intel about a Jaffa plot to attack the planet.

SG-1 hatches an elaborate plan to try and capture Adria, using Vala as bait.

Trapped on board the Odyssey, the members of SG-1 must live out the rest of their lives together when Carter activates a time dilation field to save the ship from destruction.