"Supernatural" fans at the 2014 San Diego Comic-Con panel on Sunday morning, July 27, were given an awesome foretaste of Demon Dean (Jensen Ackles) in action. Cast members Jared Padalecki (Sam Winchester), Jensen Ackles (Dean Winchester), Misha Collins (Castiel), Mark Sheppard (Crowley) and executive producer Jeremy Carver were at the panel to talk about what will go down in "Supernatural" Season 10.

According to the Mashable report, the preview was only exclusive to those who were at the event with filming not allowed and the networks not releasing what was shown at the Comic-Con panel. In the sneak peek, Demon Dean can be seen tied up and asking Sam Winchester the question "Which one of us is really a monster?"

Executive producer Jeremy Carver revealed that Dean's transformation will have an enormous effect on the CW TV series. "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," Carver teased in the Zap2it report.

In the Buddy TV report, actor Jensen Ackles teased one major change on his character in Season 10. According to the 36-year-old actor, Dean's soul has become so twisted that he does not care about the Impala like the way the real Dean Winchester does.

The transformation of Dean Winchester into a demon points to the King of Hell, Crowley, when he convinced the older Winchester sibling to have the Mark of Cain in order to kill a Knight of Hell, particularly Abaddon (Alaina Huffman). When asked about Dean's relationship with Crowley in "Supernatural" Season 10, actor Mark Sheppard teased at the Comic-Con panel that fans will have to wait and see if Crowley can control the latest addition to the demon family.

Jensen Ackles further added that at some point in the show, Crowley will be thinking it was a bad idea to have a Demon Dean. As for Castiel, actor Misha Collins shared that his character will be more concerned in patching up Dean again than recovering his fading angel powers.

"Supernatural" Season 10 is scheduled to premiere on Tuesday night, Oct 7, at 9 pm ET/PT on the CW Network.

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