With Gabriel unable to supply the needed grace to open a rift to Apocalypse World, Sam decides to capture Lucifer and use his grace as a continuous power source to keep the rift open. Working together, Gabriel and Rowena succeed in capturing Lucifer. The Winchesters, Castiel and Gabriel then travel through the rift to Apocalypse World. However, after learning that his son is in Apocalypse World, Lucifer eventually breaks free and travels through the rift, leaving Rowena to scramble to find a way to keep it open without Lucifer to power it. In Apocalypse World, the Winchesters rescue two refugees from bestial vampires and learn that the only way to Mary and Jack's camp is through a tunnel full of the creatures. Though Dean , bella , Castiel, Gabriel, and one of the refugees, Maggie, make it, Sam is killed by the vampires in the process. A grief-stricken bella, Dean , Castiel and Gabriel are finally reunited with Mary and Jack in their camp in the ruins ofDayton, Ohiowhile Sam is unexpectedly resurrected by a recharged Lucifer. Lucifer requests Sam's help in building a relationship with Jack and insists that they need his help to defeat Michael. Sam reluctantly leads Lucifer to the camp where Lucifer meets his son for the first time.