By Samantha Highfill
Updated January 14, 2014 at 12:00 PM EST
Michael Courtney/The CW

Supernatural‘s mid-season finale left us with our jaws on the floor and tears in our eyes — if only we looked as pretty as Dean does when he cries, amirite? In case you need a reminder, things ended with a not-so-friendly Gadreel taking off in Sam’s body, but not before he killed our favorite prophet Kevin Tran (Osric Chau).

When we spoke with executive producer Jeremy Carver immediately following the event, he explained the decision to lose Kevin as well as what comes next for Dean. But what’s next for Castiel? And what’s happening with the spin-off? We caught up with Carver once again to follow-up on some of his answers, as well as get some more information about the second half of season 9:

ENTERTAINMENT WEEKLY: Last time you talked to us, you mentioned the introduction of Cain, and the last time we met a pair of brothers, Lucifer and Michael, they had a very direct and very dangerous parallel to Sam and Dean. Are we going to see similar parallels with Cain and Abel, and what could that mean for Sam and Dean?

JEREMY CARVER: Well unfortunately I can’t go too much into it, because I don’t want to ruin the Cain introduction. But needless to say, I think that there’s a strong brother component to Cain [that] I don’t think goes undealt with. Yes, it’s something that we absolutely have not ignored.

With the war brewing in heaven, have you all discussed actually casting God?

The topic of God is often a big topic of discussion around here. For the most part, we’ve made certain suggestions, we’ve made certain hints, and we’ve certainly discussed it. I think for our purposes, God as an absent father really has served the story best so far, but like I said, there have been certain suggestions and hints, which we’ve left out there, so we haven’t totally ignored God. We just haven’t brought on the character with the character name of God. It’s absolutely a subject of discussion, but like I said, I think some characters in our overall story we’re telling here, for the time being at least, might be best left unintroduced.

I also want to touch on Castiel having stolen another angel’s grace. I would assume that’s going to have side effects, so what does that mean for Castiel going forward?

Well, I think the most important thing about Cas is the idea that he has a grace at all and that he’s back in the fray. He’s going to be back in the fray in a way that maybe he never expected or asked for. The idea of having taken another angel’s grace [is] certainly something that we’ve never dealt with before, and I feel like most times, when we introduce something that’s a slight wrinkle or a new take on our lore, there normally is an explanation or a consequence as it were, and that might just be the case with Cas as well. The immediate thing being that he is an angel again. The consequence that I’m speaking of here is that he is – I’m repeating myself – back in the fray even more than he’s expected.

From angels to demons, what’s in store for Crowley in the second half of the season?

Crowley’s been thrown an interesting curve ball this year in that he’s essentially in a fight for the throne of Hell while going through something of a personal crisis, if you could call it that, in that he has, to I think his discomfort, found himself yearning for human blood more than maybe he’s willing to let on. I think he’s got an interesting dilemma this year of really saying to myself, “What is it that I really want out of all of this?” He’s sort of going through, I don’t know, maybe it’s an existential crisis that we’re having the King of Hell go through. We certainly love it, and it’s very juicy, and it only gets more intensified and personal and down and dirty as the season progresses. So we’re really thrilled with Mark’s performance, what he’s bringing to it, and what the writers have come up with in terms of a progression for him this year.

With the death of Kevin Tran, does this mean a new prophet is going to come into play?

Well, let me say this: We’ve established that when one prophet goes down, another prophet is activated, so let me just say, we deal with that. We address that.

Let’s talk about the spin-off. It’s still slated for episode 20, correct?

That’s about as much as I can tell you, but yes. It is episode 20.

Have you started writing it?

Yes I can say that, yes! We’re excited! We think the fans will be excited.

What has been the biggest challenge with writing this new world?

We’re on a show that’s in its ninth year, so one significant challenge is, “How do you create an entirely new show that feels like its related to your existing show but [is] carving out a new sort of universe of stories as it were, so you feel like you’re not having to repeat yourself?” Because after nine years, you’ve covered a lot of territory, so I think everyone here is very excited that we’ve done that. We’ve created a world that feels like the Supernatural world yet has so much more story to be told that doesn’t trample on the mother ship’s terrain. You’ve got two shows that are going to be able to exist in total harmony, I think.

Supernatural airs Tuesdays at 9 p.m. on The CW.