Supernatural Season 10 Spoilers: What Happens When Cain Returns?

Supernatural returned with a new episode for Season 10 on Tuesday night, and the show has made it clear that the Mark of Cain is affecting Dean in horrendous ways. We know that Cain (Timothy Omundson) is returning later this season, but what happens when he does?

"Dean's interaction with Cain will have a profound effect on Dean, how he thinks about the mark, and how he thinks about himself with the mark," showrunner Jeremy Carver tells E! News. "It's a pretty wonderful episode and what it means for the season-long arc is pretty dramatic. We're excited about this episode."

But until Cain arrives, Dean will continue to suffer and those around him will be in pain, too. "Everyone's pretty shell-shocked by it," Carver said of Dean's recent massacre. "As concerned as they are with Dean's welfare, there are even bigger concerns as to how they can stop this from happening again. That's really going to drive our guys to the end of the season, dealing with the Mark and trying to prevent this from happening again."

But will Sam and Dean work together or drive each other apart? "The brothers are going to be in concert with some things, not in concert with some things, and they're going to have to deal with people they'd rather not deal with, make deals they'd rather not make, and all of this is going to make them ask some very hard questions as the season goes on," Carver said.

So have no fear, Supernatural fans, as Dean won't push his little brother away. "It's going to be a little bit of both allowing Sam to help and taking it on himself," Carver said. "The boys are going to be open with each other and not open with each other at the same time when it comes to the Mark. Dean's not going to completely admit how it bothers him sometimes, but Sam is not a dummy. He knows how it's affecting Dean now, but then again, he might not always say how he knows it's affecting Dean. It's the elephant in the room as the season heads to the end."

What do you think will happen on Supernatural this season? Let us know in the comments section.