TVLINE | Cas has been in Heaven for a little while now. How will he re-enter the action? And is he any different?
ANDREW DABB: When Cas comes back [in this Thursday’s episode], we’re going to get a lot of clarity in terms of not only why he’s been in Heaven for so long, but his own point of view on why he went. Some people are looking at it like, “He went to Heaven because he’s choosing angels over Sam and Dean,” and things like that. What’s going to come out very strongly when he comes back is that what he’s doing, he views as doing for our guys. That’s been a big part of the season overall: Sam and Dean have proven themselves as heroes, certainly to everyone around them. So whether it’s Cas or Crowley or Mary or Mick until his unfortunate demise or anyone else in our story, these are people who realize Sam and Dean’s importance. Sam and Dean have always been willing to sacrifice for each other. Now we’re seeing a lot of people around them that are willing to sacrifice for Sam and Dean, and it’s really about building a sense of community.
So from Cas’ point of view, everything he’s been doing has been for Sam and Dean. When he comes back in, that will be made pretty clear, and then the question is: Where does he go from there? Once he comes back in, he’s going after Kelly. Once he comes into contact with her [and] her kid, a lot of his misconceptions may fall away. A big part of his time in Heaven has been gathering information, but not reorienting his thinking to the point where he’s against Sam and Dean or anything like that. It’s more like having moments of clarity in terms of why he’s doing this and the price he, personally, is willing to pay to keep Sam and Dean alive or to keep them from experiencing pain.
— Supernatural Boss Talks Winchesters as Generals, Cas’ Return and Deadly Fight (more spoilers in the article)