[s7e22] There Will Be Blood «Windows»

Sam and Dean discover that the Leviathans are poisoning the human food supply with a corn syrup additive. This additive makes humans lethargic and "tasty" for Leviathans but is lethal to other monsters, such as vampires, who feed on them.

While the brothers are away, Bobby’s ghost continues to struggle with his mounting rage. [S7E22] There Will Be Blood

Dick Roman summons Crowley into a devil’s trap to prevent him from helping the Winchesters. Sam and Dean discover that the Leviathans are

In the penultimate episode of Season 7, Sam and Dean Winchester race to assemble a powerful weapon to take down Dick Roman and the Leviathans. Following instructions from the Word of God tablet, they must combine the bone of a righteous human with the blood of three "fallen" beings: a fallen angel, the King of Hell, and an Alpha monster. The Quest for the Alpha's Blood Dick Roman summons Crowley into a devil’s trap

Kevin Tran remains a prisoner, forced to translate the Word of God under the threat of his mother’s life.