Dean always looks like there is a smug comment just waiting to come out. Well deserved, mind you.
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The King appears to make himself heard. To what result?
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Who tossed Crowley to the ground? He's the King of Hell!
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Why do I get the idea that Dean would rather deal with his demon than the Mark of Cain?
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Dean and Crowley are going to make a team. Who is excited?
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Dean has to listen to Crowley with an open mind in order to deal with his "demons."
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Crowley looks contemplative in this photo from "Richenbach."
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Crowley has information for Dean that Dean may not want.
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Supernatural Quotes

Dean: So you’re saying we’re both a couple of dumbasses.
Cas: I prefer the word trusting. Less dumb, less ass.

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

Crowley