Supernatural Season 10 Spoilers: Jeremy Carver Previews New Episodes

Supernatural returns with all new episodes for Season 10 tonight, and showrunner Jeremy Carver has previewed what fans can expect in a recent interview.

Dean still has the Mark of Cain, which is clearly affecting him and causing him to leave a trail of bodies in his wake. Of course, little brother Sam isn't going to just let his brother suffer, as Carver discussed with TVLine.

"What is Sam doing to help Dean?
Sam is doing everything he can. That's going to mean a Sam who is really taking stock of the declarations he's made in the last couple of years. He came out pretty strongly [against the idea of] preserving their lives if it meant losing the life of others. It's like Dean is put to the test by the Mark. Sam's value system is put to the test by what is happening to Dean. Over the second half of the season, we're going to see these guys, along with Castiel, really [searching] for a solution here. That's going to mean pairing up with folks you might not think they'd pair up with and, frankly, taking some pretty strong risks on behalf of ridding Dean of this Mark."

Two other characters will also return later this season.

"Cain and Metatron both return. What can we expect from them?

They're going to definitely each play a role that is framed around looking for a way to get rid of the Mark [and] also looking for a way to live with the Mark. These are two folks who each have a particular insight into the Mark of Cain - Cain, obviously, being a little more educated to it. They are two of the more logical people to go and question and try to enlist. What they have to say is going to both help and hurt the boys."

What do you think will happen when Supernatural returns? Let us know in the comments section.