After the massacre at the ranch, Dean, Sam, and Castiel double their efforts to find a cure for the Mark of Cain but there is nothing in the lore that…

After attacking Gadreel, Dean leaves with Crowley to track down Metatron and kill him. Meanwhile, Gadreel takes Castiel into Heaven to try and break Metatron’s connection to the angel tablet,…

Castriel investigates the mass slaughter of angels and finds a lone survivor… and an old friend. Meanwhile, Sam and Dean capture Gadreel, and Metatron begins the ending of his story.