"Cas and Sam are hell-bent on getting Dean to recuperate, whatever it takes. Once Dean’s demonic problem is taken care of, Supernatural fans are going to see Castiel travel down an important road. What you’re seeing is the first part of Castiel’s journey [and] that’s going to spin him into something even more personal. As we now know that someone from Castiel’s past will resurface in a future episode: Claire Novak, the daughter of Castiel’s vessel. That’s part of a journey where Castiel feels compelled to rectify some of the wrongs that he has committed in the last 7 years. He feels like he’s done harm to a lot of people and beings and wants to do his best to make things right. So that’s really, I think, largely his journey this season. In fact, it’s his current road trip with Hannah that will eventually lead to this future story arc. Cas’ interactions with Hannah are ultimately what propels him to reunite with Claire Novak and to start really exploring righting his past wrongs. So it’s a very important relationship in Cas’ overall trajectory."