Carter and Teal'c attempt to find the Asgard to see if there's anything they can do for O'Neill. But when they find the Asgard, the discover the replicators have broken free, and Thor needs the ancient knowledge O'Neill posesses to try to defeat them.
Carter has been taken prisoner by the human-form replicator Fifth, who claims he is in love with her and wants her to stay with him.
All in all an interesting episode, with a brilliant ending. O'Neill gets promoted to Brigadier General, and is given command of the SGC. Carter is promoted to Lieutenant Colonel. The one thing bothering me about this was the lack of ceremony for Teal'c and Daniel. They may not be part of the military, but surely they could have given them some small nod of appreciation?