Overview
"Sacrifice" is the twenty-third and final episode of the paranormal drama television series Supernaturals season 8, and the 172nd overall. The episode was written by Jeremy Carver and directed by Phil Sgriccia. It was first broadcast on May 15, 2013 on The CW. In the episode, Sam makes the ultimate sacrifice in order to complete the trials to lock the demons from Earth with the last trial being Crowley himself. Meanwhile, Dean allies with Castiel and Metatron ordered to finish the Heaven trials but they were ambushed by Naomi and her Angels, finally finding out what will happen when the spells are finished.
The episode received critical acclaim, many citing it as the best season finale since "Swan Song".
Plot
Jody Mills (Kim Rhodes) is on a date with a man that she thinks is named Roderick but is actually Crowley (Mark A. Sheppard). The two get along great and Crowley claims to have lost someone special too, reminding Jody of the deaths of her son and husband and to start crying. Jody goes to the bathroom to calm down, but falls under a spell Crowley casts that causes her to choke on her own blood, unbeknownst to her there is a hex bag in her handbag. Sam (Jared Padalecki) and Dean (Jensen Ackles) call Crowley and demand he stop and he offers them a deal, using the little time Jody has left to force the issue. The deal is that they stop the undertaking the trials to close the Gates of Hell and give him the demon tablet, and he will stop killing Jody and everyone else they've ever saved. Dean agrees on the condition they trade the angel tablet for the demon tablet and Crowley agrees if they say "I surrender."
In order to make the deal happen, Kevin Tran (Osric Chau) digs up the first half of the tablet where he hid it, ironically under a sign depicting the Devil. Kevin puts the tablet halves back together and gives it to Sam and Dean. In return they give him the key to the Bunker, telling him to wait there. At the ruins of Singer Salvage Yard, Sam shows Crowley the demon tablet to prove he has it while Crowley shows them the angel tablet. Crowley produces a contract many yards long, and Dean insists on reading the fine detail. As he does, he gets close to Crowley and snaps the handcuffs on him that they found in the Bunker - ones covered in spell work that trap Crowley.
From Wikipedia (CC BY-SA 4.0).