According to new "Supernatural" season 10 spoilers, Sam won't find out Dean is a demon until episode 3 and when he does, it's "intense." Crowley better watch his back!

"When Sam finds out that his brother is a demon and confronts him for the first time in episode three, it's intense," Jared Padalecki (who plays Sam on "Supernatural") told E! News. "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. He doesn't think Dean did it on purpose or anything. He gets pissed off at Crowley instead."

Crowley better watch out! An angry Sam is nothing to mess with - especially when it has to do with his brother!

As we previously reported, Demon Dean will drive the "Supernatural" season 10 storyline, Zap2it.com reports.

"It has an enormous effect on the season and the brothers," executive producer Jeremy Carver revealed. "The boys, Sam in particular, will really dig into how to rescue his brother from being a demon while Dean struggles with what it means to be a demon. We're really excited, most of all, with the brothers questioning who's the real monster. It's exciting, moving, very emotional and fun."

Jensen Ackles added at Comic-Con that this isn't a demon possessing Dean - this is still Dean, but Demon Dean.

"A lot of times on our show we have demons possessing a meat suit, which is lovingly what we call it on this show. This is not like that. This is actually Dean's soul that is twisted," Ackles said. "It was interesting trying to make it the same character but a different character, just twisted and demonic."

"With Demon Dean, at some point Crowley is going to be like, 'This was a bad, bad idea,'" Ackles added.

"Supernatural" season 10 premieres Tuesday, Oct. 7 at 9 p.m. ET/PT on The CW.