Zacheriah should know better than to appeal to Dean's baser needs when he is worried about Sam.
Before Dean can patch things up with Sam, he’s taken to something that looks like an upscale funeral parlor: White walls, stained glass and medieval religious paintings, gold trim. And on the table is an iced bucket of El Sol, and a plate full of cheeseburgers. (Nice continuity, Kripke!)
Immediately, Castiel and Zacheriah appear. Dean snarks about The Secret Life of Zach and Cas. (There have been a lot of Disney references this season. Does someone on the writer's staff have a nine year old?) Zacheriah tells Dean that he’s in heaven’s green room. They’ve put him there for his protection so that he’ll be ready for his big showdown. But in the background, Castiel looks constipated, and Zacheriah’s coming across like a used car salesman. Dean’s BS detector goes haywire, but he lets it lie for the moment. Instead, as soon as he’s alone, Dean calls Sam to apologize.
Sam and Ruby put the girl in the trunk, and drive to Maryland like the Gecko brothers in From Dusk Till Dawn.
I’m thinking it would be cool if Harvey Keitel showed up in this episode. Alas, it’s not to be. Instead Sam notices that Dean has sent him a voice mail, and he moons over it like a 12 year old girl until Ruby heckles him into listening to it.
But when Sam listens, it’s not the message Dean sent. Instead, it’s Dean’s voice calling Sam a freak and telling him that he’s going to hunt him down, since he couldn’t save him. Dean’s (false) words goad Sam into ordering Ruby to kill the nurse so that he can drink her blood.
Back in heaven’s waiting room, Dean tries to call Sam again, but he can’t get any reception. Castiel shows up and says that Dean is in a no service area, which is a nice shoutout to this comic
Dean confronts both Castiel and Zachariah and gets the whole story this time. Dean isn’t going to stop Lilith. The angels are setting him up to take down Lucifer. The angels want the apocalypse to come, because they like their chances. And once Lucifer is taken out, there will be peace on earth.
Of course, this is their own plan. No one knows where God is.
Castiel, however, is conflicted. He returns again and yanks Dean out of his heavenly prison to see the prophet, Chuck. There they find out where Sam is going. Castiel sends Dean to the convent and stays behind to hold off the archangels who are in hot pursuit.
Sam and Ruby get to the convent and dispatch Lilith’s minions. Before Dean can stop him, he also destroys Lilith. Then Ruby does the big reveal thing by taunting Sam. Turns out that she was the celebrity mole all the time. You folks at home raise your hands if you’re surprised. Also? Sam had the power in him the whole time. He didn’t need the demon blood. But she made him think he did so that he would drink his becoming-demonic potion like a good boy.
Sam and Dean kill Ruby, but before they get away, a portal opens. And that’s the end of the season.
I’m not really too surprised about the season ending. The big bad got free, giving the boys something to fight against next year. Ruby turned out to be evil, and the angels aren’t really on the level either.