Last night's episode of Supernatural, "Two Minutes to Midnight" featured Sam, Dean, Bobby, Crowley, and Castiel together in one room, so I may have missed something while begging the director for a wide shot to show them all in the same place at the same time. I'm sure you want to hear about the Winchesters got the remaining two rings, though, so let's focus on those for right now. 

Pestilence

Our buddy is hanging out at an old folks home a retirement community, cooking up various disease combinations for his amusement. The boys get the tip that that's where they can find him, so they're off to slice off his finger. When Pestilence's aide de camp notices the Winchesters, she suggests they book it before Pestilence loses his ring, but, oh no. Pestilence (Matt Frewer) is ticked that they've offed his brothers, so he wants to take it out of their asses. Nice work, Sera Gamble, on continuing the verbal symmetry two weeks in a row! Anyway, they're rolling around on the ground dying of syphilis and whatnot (at least in Dean's case, I doubt Pestilence put it there, and also, that's the second time this season a beastie gave one of them an STI) when Castiel busts in. Castiel's kind of human at the moment (more in this in a minute), so he's initially floored by the disease wave as well. He pulls it together enough to cut off Pestilence's finger in a nice through the glass table shot. Pestilence cryptically tells them "it's too late" before evaporating into the ether.

Death

Bobby's deal with Crowley (more on that in a minute as well) has pinpointed Death to Chicago, where he's about to kick off a storm that will set off a chain reaction of natural disasters killing three million. At first Crowley and Dean are a little confused about where specifically Death is, but they track him to a pizza parlour. Dean sneaks in with an angel/demon/Horseman-killing hand scythe from Crowley, which promptly burns up his hand because it belongs to Death (Julian Richings) anyway. Death is more interested in a chat over a deep dish than a fight, so Dean hears him out. Seems Death is as a old as, maybe even older than, God, and he's none too keen on the Devil yanking his chain. He's all very Zen about his place in things, life-death balance stuff (though he does claim that one day he will reap even God). He hands over his ring on the condition that Dean let Sam say yes to Lucifer and jump in the pit. Dean agrees.

Okay, now that that's out of the way, let's get to the good stuff.

Castiel

Castiel gives our boys a ring from his hospital bed: after carving an angel-expelling sigil into his own chest with a box cutter (the badassery of which has not yet worn off), he turned up unconscious on a fishing boat outside of Delacroix.* His big spell drained his angel batteries, though, so he's stuck as a human until they recharge (if they recharge?). He very sweetly tells Dean that he owes him an apology since the latter did not say yes to Michael and further explains that Dean is not the hollowed out shell of a man that he thought Dean was. Aw! Also, I know just how that feels. Later, while off on Bobby and Sam's mission to destroy Croatoan virus posing as flu vaccine, Castiel takes a completely different approach to Sam's "maybe I can control Lucifer" plan (Dean very vocally said no). You see, Sam and Dean have exceeded Castiel's expectations time and again, so maybe Sam could do it. Aw. Castiel is just a big marshmallow this episode. He also gets to beat some trucker with a gun butt (in the name of saving everyone, don't worry) and shoot the head off one of the already infected, so he's not gone entirely soft.

*I realize that they couldn't have predicted the oil spill, but it sort of makes Louisiana (at least I think that's the Delacroix being referenced) seem like a poor choice in retrospect.

Crowley

Bobby did indeed take Crowley up on his offer (with tongue! Crowley's got the pic to prove it, which is just one more reason to love him tonnes), and now he's got Death's location. Sam and Dean have a little chick flick moment about Sam's low self esteem (poor thing says that he's the least of them), which Crowley interrupts with the Croatoan distribution news. It takes the Winchesters forever to figure it out, causing Crowley to quip, "It's a good thing you have your looks." So true! Before they drive off on their own little quests, Crowley points out that it was stupid of Bobby not to ask for his legs back in his deal (I said the same myself), but he's decided to give them back anyway.* Also, he's hanging on to Bobby's soul as insurance until the world is no longer ending. The rest you already heard about, although you can be assured that there was some more business of Dean being dim and Crowley being awesome. 

*If there was any doubt, you must know that this means that Bobby's for sure going to die in next week's season finale.

The Final Moments

Dean and Bobby have a little talk in some garage or other on Bobby's expansive property (Bobby reveals that he's been walking up and down stairs all night, and his giddy delivery of "I'm sore" made me love Jim Beaver that much more), wherein Dean demonstrates that the rings magnetically stick together to form the key and that Death served up a heaping plate of exposition about how they work off screen. When Dean reveals that he promised-with-fingers-crossed Death that he would let Sammy jump into the pit, Bobby suggests that maybe they should have a little faith in Sam: he kicked total ass on their mission, saved a bunch of people, and has been doing so since he was 12. Dean agrees that they ride Sam too hard. Then Bobby puts it to the point: is Dean more afraid of losing Sam than he is of losing? Hmm. We'll see next week.

In other news:

• Pestilence likes to make people vomit bright green.
• All that demon blood Ruby said Sam needed to drink? It strengthens the vessel to contain Lucifer. Not sure how that fits in to Sam's other demon-blood related abilities, but that's nice to know. Anyway, I think Castiel was trying to say that Sam's going to have to get demon blood drunk to follow through on his plan.
• Bobby, Sam, and Castiel blow up the warehouse, but we don't get to see them walking away from the explosion like the cool guys they are (stupid budget).

Next week: Apocalypse Maybe.