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Season 9, Episode 23 -"Do You Believe in Miracles" - Dean feels the effects of the First Blade, and Metatron makes his move against humanity. Meanwhile, Sam, Dean and Castiel face shocking consequences when taking the fight to Metatron.
This series rocks! Season 5 is by far the best. Unfortunately, things went down hill after that as the producers seemed to run out of ideas. It was a very bad idea to kill Bobby off. They should have at least kept him alive as a ghost permanently instead of finishing him off.
Season 10, Episode 7 - "Girls, Girls, Girls" - Rowena returns and tries to recruit and train followers in the art of witchcraft, but Sam and Dean devise a plan to stop her. Meanwhile, Hannah runs into a blast from her vessel's past, which complicates things for her and Castiel.
Season 10, Episode 10-"The Hunter Games" - Sam and Dean double their efforts to find a cure for the Mark of Cain, after the massacre at the ranch. Meanwhile, Rowena plots against Crowley; and Castiel tries to mend his relationship with Claire, who is bent on revenge against Dean for killing her friend.
Season 10,Episode 14-"The Executioner's Song" - Dean, Sam and Castiel deal with Cain's return. Meanwhile, Crowley and Rowena continue to grow closer, but Rowena confronts him when he bails on plans with his mother to help the Winchesters.
Season 10, Episode 19-"The Werther Project" - Sam searches for a magical box built by a former Men of Letters that may be able to cure Dean of the Mark of Cain. But the box contains a deadly alarm system that puts the brothers' lives in danger.
Season 10 ,Episode 23 -“Brother’s Keeper” – Season 10 ends with Dean making a shocking decision regarding the Mark of Cain that may change not only his life but Sam’s too. Meanwhile, Crowley and Rowena face off, and Castiel gets caught in the middle.