"Supernatural" season 10 spoilers hint that the brothers will have to go on a darker path before they see the light. Throughout the whole process, Sam blames Crowley for Demon Dean.

According to the "Supernatural" season 10 spoilers by E! News 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," he said.

It was Crowley who introduced the Mark of Cain to Dean and the First Blade, which eventually possessed him. The first few episodes will see Crowley and Demon Dean hopping from town to town and raising hell.

Meanwhile, Cartermatt teased "Supernatural" season 10 spoilers when it reported that things "are going to get way worse before it gets better" for the brothers.

"Sam was going to undergo a downward spiral of sorts in an effort to try to bring his brother back," it said.

Earlier, showrunner Jeremy Carver revealed "Supernatural" season 10 spoilers toEntertainment Weekly during the Comic-Con when he said that both Jensen Ackles and Jared Padalecki will have equal intersting story arcs.

"I know there's always this concern of one brother having the story, one brother not having the story, but both brothers will very much be having stories," he said. "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."