While the Winchesters' efforts to return to the other world to rescue Mary fail, Ketch is revealed to be working with Asmodeus, who reveals in turn that the source of his power is Gabriel, who actually faked his death during his confrontation with Lucifer but was sold to Asmodeus by the children of the real Loki. After their first attempt to enter the other world traps Jack in that reality, the Winchesters retrieve the demon tablet, a translation of it reveals the ingredients needed to open a portal to the other world. As Jack sides with Mary and the humans against the angels, the Winchesters and Castiel gather the ingredients for the spell to open the portal while Lucifer tries to re-establish himself as king of Heaven in the absence of God and other archangels. After Ketch rescues Gabriel, allowing the Winchesters to use his grace as part of the spell, the initial raid on the other world fails to achieve more than Dean rescuing the alternate version of his deceased friend Charlie Bradbury, but Gabriel flees in fear after an attack on the bunker by Asmodeus. With Heaven in desperate straits after Lucifer fails to hold the angels together, Castiel is charged with finding Gabriel while the last ten angels try to keep Heaven in order, leaving the Winchesters to mount a new assault on the other world with Gabriel and Lucifer. They are able to rescue a range of human survivors from the other world, including the alternate versions of Bobby and Charlie, but Gabriel is killed in the process and Lucifer and the alternate Michael follow them through.