7.23 Survival of the Fittest

{{Episode |Infobox=

Title	Survival of the Fittest
Episode #	Season 7, Episode 23
First aired	May 18, 2012
Directed by	Robert Singer
Written by	Sera Gamble
On IMDB	Survival of the Fittest
Outline	Dean convinces Cas to join them in their attempt to kill Dick. With the help of Meg, Dean succeeds in killing Dick, only for him and Cas to be whisked away.
Monster	Dick Roman Leviathans Crowley
Timeline	May 2012
Location(s)	Whitefish, Montana (Rufus's Cabin)
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|Synopsis= Dick knows that Dean and Sam need Crowley's blood for the leviathan-killing bone. He believes that Crowley has hidden some away in case of emergency and the two begin to work out a deal together. He offers Crowley and his demons control over Canada while the leviathans will keep the U.S.A. Plus, they will leave the demons alone in exchange for betraying the Winchesters, giving them the blood of another demon rather than his own blood. Crowley accepts and hands Dick a really, really, really long contract, specifying the terms and conditions of their pact.

Meanwhile, the brothers are looking for the bone of a righteous person and, while driving, catch a report on the radio about Dick being at SucroCorp. Following a joking idea from Dean, they break into a nunery crypt and find a nun that they think fits the bill of being a righteous person and start to remove her bones from her crypt. Back at Dick's office, he and Crowley finish going over their contract and sign it.

Sam and Dean go back to the cabin and perform a ritual to summon Crowley there. However, he does not arrive. Meg shows up instead, along with Castiel. Dean goes outside where Cas is waiting and tries to talk with him, but he starts to speak about testing on animals. He finally snaps out of it and informs the brothers that the angels in his garrison have been wiped out and that Kevin Tran is missing. Just then, Crowley teleports in and, after threatening Cas and Meg and realizing that Cas is now insane, gives Sam and Dean a vial filled with blood. They ask why he came late and he responds that Dick captured him and made him a deal. He insists, however, that he lied to Dick about accepting his offer and that the blood in the vial really is his. He then goes away, but not before promising to get Meg after all is said and done. He also informs them that Castiel could be very helpful in killing Dick, but Castiel denies knowledge of what Crowley is talking about.

Bobby, in the meantime, has bought a machete and tries to steal a truck, while still in Louise's body. He accidentally touches some iron and is pushed out of the maid's body, but repossesses her when he spots a newspaper article about Dick and becomes enraged again. At SucroCorp, Dick tells Susan to fetch "the arm" from a freezer and Kevin tries to get out of the room that he's been locked up in. A Leviathan lab tech brings a young girl in and orders her to have a seat. She introduces herself as Polly to Kevin, but otherwise remains silent, under the influence of the Leviathan-tainted corn syrup.

The Winchesters finally mix the three bloods of the fallen and pour the mixture onto the nun's bone they stole. Nothing happens and they realize they have no way of knowing for sure whether it will work or not. Cas returns with ham sandwhiches for the brothers, careful not have use ingredients poisoned by the Levaithan, and insists that he cannot go with them to kill Dick.

Susan brings Dick a case and informs him that the "delegates" are on their way. He then opens the case and takes out a severed arm...belonging to the real Richard Roman. Dick and Susan go to greet the delegates while Kevin starts picking the lock on the door with a pin. He gets out, then notices Dick and the delegates having a meeting. Dick explains to his fellow Leviathans his plan to take over the entire U.S. and has the lab tech bring in Polly. He demonstrates a new dairy creamer additive he's created that kills skinny humans, whose trait of being thin is not prefered by Levaithan for food. It also breeds out other undesirable traits. It's injected into Polly, who throws up and dies. Kevin heads towards the exit, but before he can escape, he is re-captured by Susan.

Outside, Dean and Sam hack into the surveillance cameras using a trick they learned from Charlie Bradbury. They spot Dick on the camera in the conference room still talking to the delegates. Then they check another camera and see Dick in another office. When they check a third camera, they Dick walking in a hallway. They realize that he has had a bunch of Leviathans take his form to confuse them. All of a sudden, Louise arrives in a pick-up truck and Sam recalls that she's the maid at the motel they stayed at near the Alpha Vampire's lair. He figures that it's Bobby and goes after him. Bobby tries to kill Sam by choking him, but sees his reflection in a window and stops himself. He disappears and the brothers take Louise to a hospital.

Back at Rufus's cabin, Meg criticizes them for not taking care of Dick and Sam explains that more Leviathans morphed into Dick's form in order to protect the original. Cas once again says he can't help them and Dean gets angry at him, telling him to clean up his mess. Cas teleports away, then comes back with a game of Twister. Meg points out that, since Cas was the Leviathans' original vessel, he can tell which of them is the "real fake Dick Roman." That night, Bobby reappears and requests that they burn his flask to prevent him from becoming a vengeful spirit. The boys oblige and Bobby moves on.

Later, Dean finally convinces Cas to accompany them and tell him the plan. Dean also alludes to Castiel that he has forgiven him for all he did.

The following day the plan begins. They drive through a SUCROCORP sign to call attention to themselves and Meg acts as a distraction while the other attempt to infiltrate the building. Sam gets split up from Dean and finds Kevin, who informs Sam that they must blow up the laboratory containing the creamer. Dean and Cas find the real Dick, who thanks Cas for getting him out of Purgatory and then throws him across the room. Dean stabs Dick in the chest, but he is not affected by it. Dick taunts them, only to have his Castiel pull his head back so Dean can stab his through the head with the real weapon.

Just as Sam and Kevin arrive, Dick starts to pulsate an aura around him as he dies. With a loud explosion of black goo, Dick is gone, only to reveal that Dean and Cas have disappeared as well. Crowley and two demons appear and take Kevin, leaving Sam entirely alone.

Elsewhere, Dean and Cas find themselves in a dense, dark forest. Cas tells Dean that they are in Purgatory before promptly disappearing, while Dean stands surrounded by glowing eyes.