"Supernatural" season 10 spoilers reveal that Demon Dean will become a womanizing party animal on steroids, as the executive producer hints that Sam might break a few rules in order to find his brother.

Showrunner Jeremy Carver teased "Supernatural" season 10 spoilers to TVLine as he said that Demon Dean will find out "what kind of demon he's going to be."

Jensen Ackles described Demon Dean as "an ultra version of a womanizing party animal," which makes him very unpredictable to get a handle on, even for Crowley himself.

Being totally unaware that Demon Dean doesn't want any help, Sam will try everything in order to track down his brother. This obsession will lead Sam "to do some questionable things that will make him, and certainly the audience, wonder which one of these guys is the true monster," Carver said.

As for Castiel, he will try to bring his friend back or destroy him since he's living on borrowed time. Jensen Ackles explained: "Even though it might be hard to hear, it might be hard to say, he tells Sam, 'Listen, you know what you have to do if things don't go right.'"

The official "Supernatural" season 10 spoilers reveals: "Dean is living it up as a demon while Sam hits rock bottom in the search for his brother. Dean (Jensen Ackles) is a demon and running amuck with Crowley (Mark Sheppard) while Sam (Jared Padalecki) tries to figure out what happened to his brother. Meanwhile, Castiel (Misha Collins) is dealing with his diminishing grace."

Jensen Ackles admitted in an earlier interview during the 2014 Supernatural Vancouver Convention that it was quite difficult to play Demon Dean.

"It wasn't Dean, and it was a twisted version of Dean. So, yes, to navigate that and to keep those lines somewhat clear in my mind was difficult. It's not something I've had to do before. So I struggled with it a little bit," he said.