Dominion

In an attempt to capture Adria, the team uses Vala as bait, only to have Ba'al beam the Orici away in SG-1's time of victory. When they track down the parasite, they discover Ba'al wants to end the reign of the Ori just as much as the SGC, and he's taken a drastic course of action to do so, implanting Adria with one of his cloned symbiotes. The symbiote is ultimately removed and eventually killed, but Ba'al fatally poisons Adria beforehand and in order to survive she ascends.