Cure

Cure is the tenth episode of the sixth season of Stargate SG-1.

Plot
On the planet Pangar, several people stand in front of the Stargate. They talk about the visitors who will soon arrive (The leader expects a great being.) that may had more advanced technology than theirs and when the Stargate activates SG-1 comes through. The team is led into a city, where they talk with the representatives of Pangar about diplomatic negotiations. The Pangarans also show them their greatest invention, the Tretonin, which gives them perfect health.

At the ruins with the Stargate, Jonas and Teal'c meet Zenna Valk, with whom they talk about the Stargate. In the city O'Neill and Sam continue their negotiations about the Stargate and the Tretonin and it is revealed that when they give ten addresses to peaceful worlds, the Pangarans want to visit worlds which are under Goa'uld control. Back at the ruins, the two other are led into an underground chamber where they find out more about the Goa'uld, who once ruled the planet. Zenna also wants to tell them something about the Tretonin but when Jonas later confronts her she doesn't want to talk. Because of this Jonas sneaks into a tent and searches through some material, where he finds a map of the city.

At night Jonas and Teal'c sneak into a large facility, where they find a large basin full of Goa'uld symbiotes. They are discovered and during a fight Jonas and a guard fall into the basin. While Jonas can be rescued, the guard is infected with a Goa'uld. On the next day the leader of the Pangarans informs SG-1 that the symbiotes are used to produce Tretonin. When they want to know from where they got all the symbiotes, despite not knowing how to travel through the gate, they are confronted with a Goa'uld queen. They then talk about the infected man who shows an unusual behavior for a host and so SG-1 decides to call the Tok'ra.

Jonas later talks with Zenna, who apologizes to him. In the facility two Tok'ra, Malek and Kelmaa, examine the infected man and later the queen. It turns out that the queen will die soon. However, the symbiote inside the guard has no knowledge that a queen is supposed to pass on. Dr. Fraiser later informs SG-1 that the Tretonin destroys the immune system of the user so the user becomes dependent of it. The Pangarans later reveal that they found the queen 60 years ago and because of their researches they finally developed the Tretonin. However now they have no possibility to reverse the effects of the Tretonin. In the underground chamber Jonas, Teal'c and Zenna do more researches, where they find out that Ra once lived on the planet. It also turns out that the queen is in fact Egeria, the mother of all Tok'ra, who was defeated by Ra and imprisoned here. They talk with their teammates about their researches and then inform the Tok'ra about it. However they tell them that they are not able to easily find an antidote because there is something strange about the symbiotes. When the Pangarans refuse to let Egeria free, Kelmaa sneaks into the room with the queen. She sacrifices herself, leaving her host so that Egeria can enter her and be free. O'Neill later talks with Carter about what will happen now, when Egeria awakes. She tells them that she will die soon but she tells them that she is happy about what has happened to her children.

Jonas in the meantime talks with Zenna about his people and how they built a naquadriah bomb. Egeria later reveals that she passed on a flawed gene to her children so that they would stop producing Tretonin. She however also reveals that she knows about how to find an antidote, which will be her final act. Because of this the Pangarans apologize to her. Later the dead Egeria is brought away and the Pangarans hope that there will be further negotiations. The episode ends with Carter dialing out.