Watch Supernatural Season 11 Full Movie
... In the Brother's Keeper, Death reveals a terrifying new mythology, which dates back to before earth was created. Before God created the world, there was a "destructive, amoral force" called the Darkness. God and his archangels managed to beat back and lock away the force, and God created the Mark as a lock and key. The creator bestowed this Mark on Lucifer, who was driven to jealousy of mankind by the Mark, and he shared the Mark with Cain.