Season 10 of the CW's "Supernatural" will pick up with the unleashing of Dean Winchester's demonic side.

"Demon Dean" goes on a rampage in a bar where he ends up killing one man and injuring another.

Jensen Ackles, who portrays the alcohol-loving philanderer, is now focused on portraying Dean as a demon in the first few episodes of season 10.

YVR Shoots shared photos from the set of "Supernatural" where Dean and brother Crowley looked like they were partying at a pub with a sign that read "Karaoke 2 Nite, Drink [S]pecial."

Ackles said that Dean will have some action in the bar.

"Fans will have to tune in to find out just how bloody [Dean's] upcoming bar fights will get," Ackles said at the San Diego Comic-Con in July.

Now that Dean's storyline in season 10 is planned out, what will happen with his brother? Executive Producer Jeremy Carver told Entertainment Weekly that Crowley will have a storyline of his own.

"I know there's always this concern of one brother having the story and one brother not having the story," Carver said. "But both brothers will very much be having stories. It just so happens that at the beginning of this year, their stories very much revolve around the well-being of each other, which we like."

Angel Castiel will return in season 10 to help Demon Dean. But, Castiel is faced with his own problem: losing his life force. Misha Collins, who plays Castiel, told Zap2it that Dean's being a demon is "definitely driving a very, very large wedge between the two [brothers]."

"I think that Castiel really doesn't see Demon Dean as Dean," Collins said. "He sees him as a monster that, one way or another, needs to go."

"Supernatural" will return to the CW October 7.