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

What's this supposed to be, the suite life of Zach and Cas?

Dean

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.