Season 9 Volume 49:

9.18 Arthur's Mantle
Daniel finds Carter's laptop hooked up to an unfamiliar device, which shifts its users to an alternate dimension. Teal'c is investigating a planet of Jaffa warriors. He believes that Volnek, a warrior, may have been brainwashed by the Ori, and he finds himself in an intense match with the violent warrior.

9.19 Crusade
Vala reappears with important news. She learned that the Ori have steadily been building an army and constructing a fleet of ships, and plan to stage a massive crusade. Now, SG-1 is left only with the uncertainty of their friends safety and the doom they are soon to face.

9.20 Camelot
Upon receiving a lead on an Ancient device, the team travels to the village of Camelot. Carter learns that the device has the ability to completely obliterate the Ori's galaxy. To the team's horror, the first Ori ships begin arriving before she returns. SG-1 prepares for their biggest battle yet.