When a terrorist attack decimates a Jaffa summit Teal’c strikes out on a quest for revenge, believing that the perpetrator is one of his own pupils.

When a plague-like illness kills ten men inside a maximum security prison, Scully tries to get into the quarantine site and discover the cause and origin of the contagion, while…

Castiel tells Sam, Dean and Bobby about the war in Heaven and how he and Raphael became enemies. Bobby believes Castiel is hiding something, but Dean refuses to believe it.