been back this whole time searching for whatever force brought him back and hunting with his mother's side of the family, the Campbells, led by their grandfather Samuel who was also resurrected. While hunting with Sam again, Dean quickly notices how different he acts. These include using a baby as bait, allowing a child to go through a torturous treatment to gain information, and allowing Dean to become a vampire. After facing the goddess, Veritas, Dean and Castiel question Sam's behavior. Castiel then reveals that Sam's soul is not with him and is still trapped in Lucifer's Cage. It is revealed that Crowley brought back Sam and Samuel Campbell so that they could help him find Purgatory, the afterlife of monsters, and that Samuel has been working for him. Crowley then states that if Sam and Dean help him he will return Sam's soul, but if they do not help him he will send Sam back to Hell. Although Sam still retains his memories, likes, dislikes, and is capable of making rational decisions, he is completely without emotion and appears almost inhuman. Upon Dean's request, Death retrieves Sam's soul from the Cage and returns it to him at the end of the sixth season's mid-season finale "Appointment in Samarra". He gives Sam's mind a "protective wall" to prevent any negative effects it might have on him otherwise, but Death also warns him not to scratch at the wall he has built, or his memories from Hell will destroy him. However, Castiel, in an attempt to distract Dean and Bobby while he attempts to enter Purgatory, brings down the wall, ultimately causing Sam to remember his time in Hell. In the season finale, Sam spends much of the episode attempting to recoup his shattered soul, including the memories of his soulless self and tortured self. Once complete, he reawakens, though still struggling with the visions of the Cage that his soul endured. Season 7 After Castiel's actions result in the release of the Leviathans – God's first beasts – Sam is left struggling with the restoration of his memories of his time in Hell, even if he remains dedicated to helping Dean and others stop the Leviathans. During this time, he has a reunion with his old Kitsune friend, Amy Pond, who has become a mortician feeding on the dead to sustain her, although Dean nevertheless kills her when he discovers