Surviving a full year in Purgatory with the aid of the vampire Benny after being abandoned by Castiel, Dean and Benny eventually escape. Dean is angered to learn that Sam did not even search for him. Reuniting with Kevin, they find another Word of God that details trials to close the gates of Hell. Dean aids Sam in completing the trials, and along the way they encounter the rogue angel Metatron and the Knight of Hell Abaddon. During this time the brothers are also given the Men of Letters bunker as a headquarters, by their paternal grandfather. Dean is horrified to learn Castiel was programmed by the angel Naomi to try to kill him. Capturing Crowley, Dean stops Sam from completing the trials when he learns it will kill his brother. When they begin to head to the hospital, Sam collapses just as the angels begin to fall down to Earth.