Ruby is back and she's going to try and help Sam take down Lilith in order to stop the Apocalypse in the Supernatural season four finale.
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Katherine Boecher guest stars as the latest embodiment of Lilith in the Supernatural season four finale, "Lucifer Rising."
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Sam and Ruby team up in order to try and stop the Apocalypse by killing Lilith in her current form in the season four finale.
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Castiel (Misha Collins) and Zachariah (Kurt Fuller) will help Dean to stop the Apocalypse in the season four finale of Supernatural, "Lucifer Rising."
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Dean confronts Zachariah (Kurt Fuller) in the Supernatural season four finale, "Lucifer Rising."
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Supernatural Season 4 Episode 22 Quotes

Dean: I need you to take me to see Sam.
Castiel: Why?
Dean: There's something I have to talk to him about.
Castiel: What's that?
Dean: The BM I took this morning. What's it to you? Make it snappy.

Dean: I'm not sure if he's my brother any more. If he ever was.
Bobby: You stupid stupid son of a bitch! Well boo hoo. I am so sorry your feelings are hurt... princess! Are you under the impression that family's supposed to make you feel good? Make you an apple pie, maybe? They're supposed to make you miserable! That's why they're family.