Supernatural Preview: Doubt Leads to Betrayal...

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I've done some shady stuff, but I am not doing this.

To what action is Dean referring with this quote? Viewers will need to tune in to Supernatural on Friday and find out. They can get a sneak peek at the upcoming installment now:

[video url="http://www.tvfanatic.com/videos/all-dogs-go-to-heaven-promo/" title="All Dogs Go to Heaven Promo"] [/video]

On the episode "All Dogs Go to Heaven," the siblings look into a killing that turns out to be the work of a skinwalker. He informs the brothers of an Alpha skinwalker that has created sleeper cells intent on murdering their families.

How can Sam and Dean prevent countless deaths? Kill the Alpha.

Return to TV Fanatic for a full review soon after this episode ends and visit our Supernatural spoilers section for a broader view of what's ahead this season.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.

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Supernatural Quotes

You betrayed me? No one in the history of torture's been tortured with torture like the torture you'll be tortured with.

Crowley

Endings are hard. Any chapped-ass monkey with a keyboard can poop out a beginning, but endings are impossible. You try to tie up every loose end, but you never can. The fans are always gonna bitch. There's always gonna be holes. And since it's the ending, it's all supposed to add up to something. I'm telling you, they're a raging pain in the ass.

Chuck