"Supernatural" season 10 spoilers show that Dean has no filter for his violent streak as "Deanmon" has now become uncontrollable that he even lashed out at his brother Sam.

The trailer released by CW Network teased "Supernatural" season 10 spoilers as it shows Demon Dean and Crowley wreaking havoc everywhere they go. At one point in the clip, Demon Dean seemingly has no problem fighting his brother as he hammers a door down to find Sam hiding inside.

Sam, meanwhile, is clutching the First Blade as he threatens to use it against Demon Dean. Of course, he couldn't do that because he's there to save his brother, not to kill him.

The First Blade belongs to Cain which he used to kill Abel. In the "Supernatural" mythology, Cain was the good guy who offered himself in exchange for his brother when he found out that Abel was actually talking to Lucifer and not to God.

Earlier "Supernatural" season 10 spoilers by E! News, Crowley will have to "watch his back" because Sam is blaming him for his brother's fate, and he will do anything to seek payback.

"When Sam finds out that his brother is a demon and confronts him for the first time in episode three, it's intense. He doesn't know that he's a demon at the beginning of season 10. But when he finds out his brother isn't just missing, he's a demon, it doesn't piss him off," Jared Padalecki, who plays Sam, told the website.

"He doesn't think Dean did it on purpose or anything. He gets pissed off at Crowley instead," Jared Padalecki said.

Earlier, Jensen Ackles revealed "Supernatural" season 10 spoilers to TVGuide at the San Diego Comic-Con panel when he said that Demon Dean will be very different because he's tainted with the Mark of Cain. "This is Dean's soul, but it's twisted."

He revealed that in the first few episodes alone, Demon Dean mauled three guys and killed two people.

"Supernatural" season 10 will air on CW on October 7 at 9 p.m.