SUPERNATURAL Season 6 Episode 7 : Family Matters

Dean enlists Castiel's help to find out what's wrong with Sam, who reveals he can't sleep or feel any emotions except for physical pain. Castiel discovers Sam's soul is missing and when he goes elsewhere to investigate, the Winchesters learn that Samuel is going to hunt down the Alpha vampire. After torturing the Alpha vampire, Crowley appears to reveal that Samuel works for him to collect alpha creatures and he is the one who brought Sam back...