Supernatural Boss Jeremy Carver Previews Tonight's Season 10 Finale

The Season 10 finale of the CW's Supernatural , entitled "My Brother's Keeper," airs tonight, and we're all set for a brother vs. brother showdown as Sam and Dean Winchester stand on opposite sides with regard to the Mark of Cain. Luckily, showrunner Jeremy Carver took some time to answer some pertinent questions and preview the finale.

Carver spoke to E! Online, which asked first if Dean is too far gone at this point.

"The question of redemption-particularly how it's interpreted by all of our major characters-is a driving one in our finale. As far as lines in the sand-Sam and Dean have been stepping over them since Dean was a demon and Sam did some nasty stuff to find him. Are there more to cross? Yes. Will they surprise and maybe even shock you? Yes."

Next, the site asked how Sam will use the new information he received about removing the Mark of Cain.

"Sam did have a breakthrough, correct. But he also failed to hold up his deal with Rowena [Ruth Connell] by failing to kill Crowley [Mark Sheppard]. So what to do now is the question. One hint, borrowing somewhat incongruously from Apollo 13: 'Failure is not an option.' Incidentally, to my father at home playing the Gene Kranz Drinking Game. Bottom's up, Pop."

Death (Julian Richings) returns for the finale, and E! Online did its best to get an answer about how he plays a role in the episode. All Carver would answer is "Come on."

As far as Crowley and Rowena go, he also indicated that there are "far richer ways than murder" to get revenge on someone after 300 years.

Last week, Dean destroyed Castiel (Misha Collins) in a fist fight. We know the elder Winchester brother is stronger because of the Mark, but how was able to beat the angel to a bloody pulp?

"Good question. But Cas, while he did try to use restraint, did eventually fight back and his grace is just fine. What Cas didn't expect and left him somewhat flat-footed was just how powerful Dean had become."

Finally, what is Carver most excited about in the finale? "I'll just say this: Jared and Jensen, not to mention Misha, Mark and Ruth, poured their hearts into this finale. I'm tremendously excited that the fans get to see these performances from a cast of players that-10 years in-are still willing to leave it all on the floor."

What do you think will happen in the Season 10 finale? Let us know in the comments section.