 Castiel, disturbed by the news and by Naomi being alive, leaves Heaven.The Winchesters and Castiel, now working with Rowena and Gabriel, capture Lucifer to use his Archangel grace for the spell, after Gabriel's proves to be insufficient.Rowena then is able to open up a rift to Apocalypse World and Castiel then travels with Dean, Sam and Gabriel into the rift to find Mary and Jack.