Stargate SG1 - Nemesis

In Nemesis, it's Thor and the Terrible, Horrible, No Good, Very Bad Day as we finally meet the enemy that has been such a scourge to the Asgard - the Replicators! Why exactly is Thor dying? What happened to him? Is it also appendicitis? Are the little wings on the Replicators used for communication or something else? Teal'c also has one of his greatest lines when he declares, "One small step for Jaffa."

Shid.