The new head of SGC, General Hank Landry, and the SG-1 team's new leader, Lt Col Cameron Mitchell, step into their positions and are immediately confronted with the thief Vala, who has a stolen tablet for Daniel to decode, one which may hold the key to a treasure.
Daniel and Vala find themselves transported to a far away galaxy where a powerful and mysterious authority is revered.
The Stargate team comes into contact with followers of a powerful god race known as the Ori and are taken aback by their blind devotion and aggressive approach towards those who don't share their beliefs.
Daniel helps Vala track down and return stolen items from the former owner of the Jaffa bracelets which keep them bound, the only way they can ultimately free themselves.
The SG-1 team travels to a world where Vala was once hailed as a goddess, only its people soon change their impressions of her and attempt to put her on trial when she admits that she exploited their adulation.
Carter is forced to use a weapon of her own creation against the Ori when they overtake a Jaffa planet using a protective force field.
SG-1 looks into the possibility that the Goa'uld are still hiding out on Earth. The free Jaffa and Earth, meanwhile, continue to quarrel.
Colonel Mitchell is hurt during an encounter with members of a legendary Jaffa tribe, and is subsequently schooled in their fighting techniques so as to engage in battle.
The SG-1 team finds a live, inactive Goa'uld specimen and after bringing it to their headquarters on Earth for observation, is shocked to discover it was made from the DNA of Anubis.
An officer is unknowingly infected with the Ancient Plague and inadvertently causes it to spread across the U.S. Orlin then comes to the SGC and tries to help Carter figure out a cure.
The mounting threat of the Ori becomes a real and potent presence on Earth.
Colonel Mitchell is wrongly accused of a murder, only new technology involving memory implantation creates a situation in which he believes in his own guilt.
A friend from the past returns to visit the SG-1 team.
Ba'al uses mind control to steer the Jaffa High Council towards a democratic government. Meanwhile, Mitchell is forced to evaluate his options when he learns that a longtime friend faces death.
The SG-1 team must try and rescue Daniel when he is a prisoner in a world controlled by the Ori and destroy a potent weapon the Ori have created.
A stargate disappears on an alien planet where the Lucian Alliance has soured.
A deadly insect population besieges a research base during a diplomatic visit.
Mitchell and Carter become invisible when they are transported into a different dimension. Meanwhile, Teal'c learns of an attack against the Sodan.
Vala opens communication with the SGC from the Ori galaxy and recounts the events of her life.
The SG-1 team comes upon Camelot while traveling on another world and tries to outthink Merlin in the process of locating a weapon.