Sam gets addicted to demon blood and the power that it brings him. The more he drinks, the less of himself he becomes. Sam turns from the moral center in the show to a cold version of his former self.

Sam and Dean Winchester use different secret codewords - or "hunter's lingo" - throughout Supernatural in order to keep their monster hunting covert.

EXCLUSIVE: Supernatural, one of the most important series in the history of the CW, is eyeing a comeback with a new iteration with prequel The Winchesters, centered on Dean and Sam Winchester’s ...