“Dominion” is episode nineteen of season ten of Stargate SG-1.
Vala is gambling on a planet when Adria, who was last seen in “The Shroud” being sent through the Ori supergate with Merlin’s activated anti-Ascended being weapon, arrives. Adria claims that the Ori are still alive, and that her proof is that she has a new fleet of ships. She wants to know why Vala is not with the SGC.
Back in “Memento Mori”, Vala had been abducted by Athena, who wanted information from her former Goa’uld possessor, Qetesh, regarding a tablet of infinite wealth. Vala claims to have figured out what the tablet means. When it fails to go to plan, the IOA loses faith in her, and she escapes.
This is all a plan, though, to capture Adria. Just as SG-1 are about to capture her, though, she is taken by Ba’al, who also has plans for her.
The Tok’ra appear for the first time in a long time.