My Demons - Dean Winchester/Mark of Cain - Supernatural

Dean's worst nightmare was to become something he's not. But what happens when the only way to defeat the enemy is to become one of them? The story of Dean Winchester and the power of the Mark of Cain throughout season 9. Spoilers up to 9x23 "Do You Believe In Miracles?" Please Comment! Music: My Demons - Starset Video rights go to Eric Kripke and the CW