Season 6

Sam and Dean were able to stop the Apocalypse, but at a terrible price losing Sam. After Sam jumped into the hole, Dean went to an old friend Lisa, there he lived with Lisa and her son Ben for a long year. Until Dean was one day attacked by a monster only to be saved by his brother Sam, who he thought was long gone, but actually mysteriously woke up in a field a year ago. That moment Dean was sucked back into the life of a hunter leaving Lisa and Ben. Once again together Dean and Sam started hunting, but for about a year when Sam was hunting without Dean he was hunting with his cousins and dead grandfather that was brought back to life. As Dean and Sam start hunting they notice something very odd about the monsters. They were acting different and not only them, but Dean was worried, because Sam was acting strange as well. They pray to Castiel for help and with that they find out that not knowing how Sam got out of Lucifer's cage, he came out without his soul. Dean tries to find a way to get Sam's soul out of the cage, but in doing so they learn surprising information about their grandfather that he is working with Crowley, who is the new King of Hell. Working together with Crowley they found out that Crowley is trying to open the doors of purgatory for himself and a mysterious partner. Dean finally comes up with an idea of how to get Sam's soul back into Sam with the help from the Angel of Death. Dean is able to convince Death to get Sam's soul, but  Death warns him that it will be dangerous for Sam, because of that he puts a wall in Sam's head to keep from Hell breaking loose. From Crowley's actions on opening purgatory, the monster named Eve, the mother of all, rises to stop Crowley only to be stopped by the brothers. With this hunt they learn the Crowley's mysterious partner is Castiel. Castiel is working with Crowley, because in heaven there is a civil war going on, because of Castiel's actions to help the brothers in stopping the Apocalypse. Castiel wants to absorb the souls that are trapped in purgatory to stop the civil war. The brother believe that was a bad idea and try to convince Castiel not to go through with it, but Castiel wouldn't listen to them. Instead Castiel tries to convice the brothers by telling them everything that happened and tells Sam that he was the one who saved him from Lucifer's cage. When the brothers were still not convinced Castiel decided to take matters in his own hands and break the wall in Sam's hand allowing all Hell to break loose leaving Sam and Dean busy. Castiel decided to betray Crowley and absorb all the souls in purgatory. With that he stopped the civil war in heaven and killed Raphael the leader of the opposing army. Castiel stopped the war at heaven only to be corrupted.

http://www.youtube.com/watch?v=qfQk4DgYOBg   (Season 6)

season 6