Castiel makes his way to the Winchesters but discovers a band of angels are hunting him, intent on exacting vengeance for what they believe is his role in their fall from Heaven. Meanwhile, Ezekiel continues to repair Sam, but informs Dean that there is a price to be paid.

The angels are embroiled in a bloody civil war, and Castiel is swept up in the conflict. Meanwhile, Dean realizes that Ezekiel is not who he claims to be and tries to warn Sam with dire results.