The Trans pay a witch to gather ingredients for a demon bomb to use against Crowley, but the witch betrays them and helps Crowley kidnap Kevin. After Sam and Dean investigate a series of demon abductions, a weakened Castiel appears to them with no memory of how he escaped Purgatory. The abductions turn out to be known future prophets, as only one prophet can exist at a time, meaning that one of them will become the new prophet if Kevin dies. Dean has flashbacks of his escape from Purgatory and deals with his guilt for not saving Castiel. Meanwhile, Kevin is tortured by Crowley into translating the tablet and reveals to Crowley that there are more tablets. Sam, Dean, and Castiel intervene and save Kevin from Crowley. Castiel breaks the tablet in two pieces and Crowley flees, taking one half of the tablet with him. Kevin and the remaining prophets are rescued. Castiel reveals that he chose not to leave Purgatory with Dean, telling Dean that remaining in Purgatory was his penance for his previous actions. Dean is distressed to learn that Castiel stayed behind of his own volition. Castiel then "checks in" with a mysterious angel named Naomi (Amanda Tapping), who asks about Sam and Dean and tells him that an army of angels rescued him from Purgatory and that he will not remember these periodic check-ins.
Source: Wikipedia
Source: Wikipedia
