Origin (Part 3)

When Daniel and Vala follow a mysterious man to find answers to their questions, they discover the Ori. The Ori, like the Ancients, are ascended beings, but pure evil entities that feel the need to be worshipped. Now, that the Ori know of life in another galaxy, they begin to send their missionaries, Priors, through the Stargate. The first planet visited by a Prior in the Milky Way is P3X-421. Daniel and Vala are nearly killed, but are saved when Mitchell and Teal'c destroy the communications device in an unstable wormhole.