Crowley (Mark Sheppard) looked forward to taking a howl at the moon together with demon Dean (Jensen Ackles) in the finale episode of "Supernatural" Season 9. However, the synopsis released for "Supernatural" Season 10, episode 2 titled "Reichenbach" teased that having the Winchester hunter with the Mark of Cain as a demon will be a problem for the King of Hell.

"Crowley (Mark Sheppard) notices Dean (Jensen Ackles) is becoming more and more aggressive. Dean tells him that's the side effect of being a demon, but Crowley knows it's something more - the Mark of Cain needs to be fed," the episode synopsis in a Carter Matt report reads. The Mark of Cain will continue to be an integral part in "Supernatural" Season 10 after the story behind the mark got revealed in "Supernatural" Season 9, episode 11 titled "First Born."

When the CW TV series return with the new season premiere episode titled "Black," the viewers will see Dean embracing his life as a demon. The synopsis for the premiere episode in a Hollywood Hills report revealed demon Dean will be running around with Crowley while his brother, Sam (Jared Padalecki), tries to find out what happened to his brother and where he went.

As for Castiel (Misha Collins), the fan-favorite angel will have to deal with his fading stolen grace in the Robert Singer-directed "Supernatural" Season 10 premiere episode that Jeremy Carver wrote. Meanwhile, the synopsis for the second episode further teased that Sam's search for Dean will put him in a dangerous situation under the hands of a mysterious hunter named Cole (Travis Aaron Wade).

"Reichenbach" will be marking as well the return of Metatron (Curtis Armstrong) as Hannah (Erica Carroll) asks for his help in saving Castiel who is becoming weak from his fading angelic grace. Thomas J. Wright directed the second episode of "Supernatural" Season 10 that was written by Andrew Dabb.

"Supernatural" Season 10 is scheduled to premiere with the first episode titled "Black" on Tuesday night, Oct. 7, at 9 p.m. ET on the CW Network. Crowley's problems with Dean's behaviour will begin in the second episode titled "Reichenback" which will be aired on Oct. 14.

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