Supernatural - Season 10

Dean is a demon and running amok with Crowley while Sam tries to figure out what happened to his brother. Meanwhile, Castiel is dealing with his diminishing grace.

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.

Sam continues to try to save Dean from the Mark of Cain. Realizing that Dean's antics are causing problems for him in hell, Crowley seeks help from a reluctant Castiel.

Sam and Dean investigate a series of werewolf attacks in an attempt to find out who the culprit is.

Sam and Dean investigate a haunting at a theatre.

Dean encounters a surprising message on Bobby's phone, and Sam and Dean investigate.

Sam and Dean discover a group of witches "gone wild" and they attempt to stop them.

Jody Mills is matched with an overeager partner during a mandatory sheriff's retreat; when a gruesome corpse is discovered, Jody calls Sam and Dean to help investigate.

When Castiel finds Jimmy's daughter in a group home, she persuades him to break her out; Crowley is faced with a big challenge.

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.

When Sam comes across a video of Charlie attacking a district attorney, Dean thinks she has returned from Oz to hunt on her own.

Dean is mysteriously transformed into a teenager. He has to deal with teenage struggles all over again, along with being a hunter.

To take his mind off of the Mark of Cain, Dean goes hunting. They track down a ghost that is killing college students through electronics and the internet.

Sam, Dean, and Castiel must deal with Cain's return. Rowena and Crowley grow closer.

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.

Dean and Sam investigate grisly, identical suicides by various people with little in common; the brothers begin to suspect that a priest is involved.

Castiel comes back and he and Sam check out a lead on the Mark of Cain. They decide to go to Bobby for help. Meanwhile Dean and Rowena meet up.

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.

Sam looks for a magical box built by former Men of Letters, Magnus, hoping it will cure Dean, but is surprised by a deadly alarm system.

Castiel tries to reconnect Claire with her mother who went missing, and calls Sam and Dean for help with the case.

While investigating a strange murder, Sam and Dean discover the killer has the same tattoo as those from the Styne family; Castiel plays referee when Charlie and Rowena must work together; Crowley turns to an old enemy for help with Rowena.

Dean takes matters into his own hands regarding Stynes; Sam attempts to come to terms with his decision.

Dean comes to a stunning decision that will alter his life -- as well as Sam's; Rowena and Crowley face off, putting Castiel in the middle.