A man is killed by his dead wife. Taking the case, Sam convinces Dean to let Jack join them, also having convinced Jack to help save Mary if he can master his powers. There are no signs of a ghost or revenant. A woman is then killed by her dead son. Both victims shared a grief therapist Mia, whom the guys question pretending to be three brothers that lost their mother. Sam and Dean get into an argument about Mary, and Sam discovers Mia is a shapeshifter. Mia says she only helps people by pretending to be their loved ones to give closure, and the killer must be her ex-boyfriend and fellow shapeshifter, Buddy. While Sam goes to Buddy's address, Buddy actually sneaks into Mia's office and knocks out Dean and Jack. When Mia refuses to kill them, Buddy prepares to shoot Sam when he walks into the room. Jack is able to use his powers to deflect the bullet away from Sam and throw Buddy into the wall, allowing Sam to kill him. Mia in Kelly's form tells Jack that even monsters can do good. At the bunker Dean gives Jack some approval and wants Sam to keep believing Mary is alive, admitting that he no longer seems to believe in anything anymore. Meanwhile, Castiel is in The Empty, a place predating even God and Amara, where all angels and demons sleep forever after they die. Castiel is the first in eternity to wake up. The entity ruling the realm takes Castiel's form and taunts him to go back to sleep as the entity hates being awake. Castiel refuses, demanding his release and forcing the entity to send him back to Earth, where the latter rejoices at being resurrected and think of dean sam his beautiful wife bella and little girl gracie who is like 8 now and must find away back to his family