Origin (episode)

Origin is the third episode of the ninth season of Stargate SG-1.

Plot
Daniel and Vala Mal Doran, still in the bodies of Harrid and Sallis, are taken by a Prior of the Ori to the City of the Gods, on the Plains of Celestis. They are left in a dining room with a copy of the Book of Origin. Another Prior is sent to the Milky Way to convert the people there. Daniel meanwhile begins to read the Book of Origin. The Prior of the Ori returns, and asks Daniel and Vala who else in the village has strayed from the path of Origin. Daniel insists on talking to the Doci, the chief Prior and mouth of the Ori. He is taken there while Vala is left behind. The Doci takes him to the Flames of Enlightenment, where he is possessed by an Ori who says, "All will know the power of the Ori".

Back in the Milky Way galaxy, General Landry orders Mitchell and SG-12 to investigate on the planet where the Prior appeared. The team brings the prior back with them. Landry in the meantime meets with Gerak of the new Jaffa nation because he wants to make a treaty with the Jaffa nation. Gerak, however, is more interested in the Prior, wanting to hear and challenge his claims.

Daniel returns to Vala, telling her the Ori believe that their ascension entitles them to worship by all Humans. Priors will be sent to convert the people of the Milky Way, and if they don't see the light, they will be "cleansed". Recognizing the threat the Ori posed, the Ancients were shielding their existence from the Ori until recently, and it is unlikely that the Ancients will do anything to stop the Priors, as they are still human. Daniel and Vala are returned to the village. Worried that Fannis and the resistance will be discovered through them, they stay in the house. Fannis comes to them, insisting on helping even if he dies. Fannis takes them to another long-range Ancient communication device, which they use to return to their original bodies and to warn Earth of the Priors. However, the device is destroyed and Daniel and Vala again enter Harrid and Sallis and witness Fannis being killed by a Prior, who also prevents Daniel from helping him. Then Daniel and Vala are taken to the Ara to be burned to death.

Back at Stargate Command, Mitchell and a team of guards go to confront the Prior meeting with Gerak, who demands an explanation. They take the staff from the Prior, but he takes it back and destroys himself in flames. As Daniel and Vala's heart rates rise when they are tied to the Ara, Mitchell and Teal'c throw the Ancient long-range communication device into the energy vortex of the Stargate, which destroys the device. Daniel and Vala are returned, leaving Harrid and Sallis to most likely burn.

Back at Celestis, at the request of the Doci, the Ver Ager administrator comes to the Flames of Enlightenment, where he is transformed into a Prior. The Doci says that great holy armies will be gathered to fight the evil and that ships will be built to send warriors across the stars. All this is necessary to spread Origin over the stars.

Vala meanwhile releases the bracelets from her and Daniel. Daniel discusses whether or not the Ancients will continue to protect them from the Ori. The fact is, however, that the Priors will come, but Landry says that they will use their strength against the enemy's weaknesses. Major General O'Neill drops by the SGC, and he and Daniel discuss the Ori, with Daniel admitting that for the first time since he came to the SGC, he's truly scared, while O'Neill reminds Daniel that they've been up against some powerful bad guys in the past and won. O'Neill also takes a flight with Mitchell in an F-302, and asks if he has his team assembled. Mitchell replies that he's made his final choices.