Sam’s soul is back in his body, except he doesn’t remember anything besides falling into the cage. However he learns of his missing soul antics from Castiel.
Sam, Dean, and Bobby investigate missing virgins and the dragons that are kidnapping them. After saving some of the virgins, Bobby reveals an ancient book being used by the dragons.
The book reveals a way to open the door to purgatory and release the “Mother of All.” The episode concludes with the dragons sacrificing a virgin and unleashing a female being, potentially the “Mother of All.”