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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If all else fails, make a phone call. Someone will surely help you with the ethics on holding someone hostage.
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Maybe two heads are better than one. What should they do about this situation?
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Supernatural Quotes

You know why God cast me down? Because I loved him. More than anything. And then God created... you. The little... hairless apes. And then He asked all of us to bow down before you, to love you more than Him. And I said, "Father... I can't." I said, "These human beings are flawed, murderous." And for that... God had Michael cast me into Hell. Now, tell me... does the punishment fit the crime? Especially when I was right? Look at what six billion of you have done to this thing, and how many of you blame me for it?

Lucifer/Sam

What is this, "The Godfather" with fangs?

Dean