Warning: major spoilers below! Do not continue watching until you have watched the
Supernatural season 10 finale, “My Brother’s Keeper.” All others may proceed! Talk about a twist! After a season filled with the hunt to cure Dean’s Mark of Cain, it turns out that Dean and Sam didn’t actually want to remove the Mark…not after they learned what it truly was. You see, when Dean summoned Death to have Death kill him, the powerful being dropped some major truth bombs on Dean about the Mark of Cain. First: Dean can never die as long as the Mark is on his arm. Second: it wasn’t just a curse…it’s a lock and a key, created by God himself to keep The Darkness, the powerful, malevolent being that existed before God and the angels, locked away. Think along the lines of Buffy the Vampire Slayer’s First Evil, and then think even scarier.
