A darkness is slowly settling over Supernatural's Dean Winchester, and someone will need to help him out of the shadows before he disappears completely.

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The veteran hunter failed to read the terms and conditions before accepting the Mark of Cain, and he has already started to pay the price. While the Mark slowly works to dull Dean's (Jensen Ackles) generally sharp moral compass, the elder Winchester's dispute with Sam (Jared Padalecki) and his questionable alliance with the King of Hell (Mark Sheppard) continue to help push him away from his true nature.

As these decisions and supernatural influences combine to drag Dean down a demonic path, Castiel (Misha Collins) will be forced to intervene.

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"I don't know how exactly that's going to play out, but I assume that Castiel is not going to want to see Dean go down that road any further than he already has. If he can do or say something to Dean that can turn him around, I'm sure he will do it," Ackles explained to Zap2It. "Dean's had to do the same thing for Cas in the past, so I feel like it's only right for Cas to want the same thing and do what he can to not only salvage Dean as a person but also to salvage Dean and Sam as brothers. At this point, part of Cas' mission is to help these two brothers in not only what they mean to the bigger picture, but what they mean to each other."

Do you think Cas will be able to save his friend while also dealing with an angel war? Tell us in the poll below!

Supernatural airs Tuesdays at 9 p.m. ET on The CW. Click the video to see a preview of the series' most recent episode, "Blade Runners."