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Charlie contacts Sam and Dean after she finds the Book of the Damned - which could help eliminate the mark of Cain; Castiel and Metatron look for Castiel's grace.
All Episodes - S10
EPS01
Dean is now a demon and is killing for Crowley. It's Dean just with black eyes, and this time he's working for the King of Hell. Although Crowley says to Sam that it's a relationship between the two of them Crowley wants Dean on his side as Dean is the last Knight of Hell thanks to the Mark of Cain and the First Blade.
EPS02
Crowley is worried about Dean getting out of control, giving him a target to feed the mark. Sam struggles to escape from Cole. Hannah tries to convince Metatron to give Castiel's grace back.
EPS10
Sam and Dean try to deal with the aftermath following the bloodbath. Castiel attempts to fix a struggling relationship with Claire, and Claire wants revenge on Dean for what he did to her friend.
EPS11
Charlie returns from Oz - Sam is scanning the internet for suspicious paranormal activity and comes across a video of Charlie beating up a district attorney. Dean suspects she's back from Oz and hunting on her own, assuming the district attorney must have been a demon. When they do find Charlie, they are shocked when she tells them why she really came back from Oz.
EPS15
Despite Dean's directive to forget about looking for a cure for the MOC, Sam continues to do research. Dean suspects Sam is hiding something but decides to focus on a murder case where they run into Cole.
EPS20
When Claire Novak gets a lead on her mother, Amelia, who has been missing for years, Castiel asks Sam and Dean to help her. Castiel feels guilty for what he did to the Novak family and wants to make amends by reuniting Claire with her mom. However, when they find out what took Amelia, they realize there is a chance Claire may not get her happy ending. Written by Adam Lee
EPS21
Dean and Sam investigate a bizarre murder and realize the killer bears the same tattoo as those from the Styne family. Eldon Styne attacks Dean and a brutal fight ensues. Meanwhile, Castiel acts as referee when Charlie and Rowena are forced to work together on the Book of the Damned. Crowley discovers his mother is missing and knows she's up to something so he turns to an old enemy for help. Written by Adam Lee
EPS22
After Charlie's death Dean and Sam are both heartbroken. Despite their feelings for the situation Dean has decided to battle against the Stynes. On the other hand Sam, Castiel and Rowena continue to translate the Book of the Damned despite Dean's orders.