After John's soul is taken by the Demon to Hell, Sam and Dean start hunting the Demon, who eventually kidnaps Sam. In a turn of events, Sam is stabbed in the back and killed, forcing Dean to make a deal to save his brother's life. He is given 1 year of life. Dean and Sam are unable to stop the Demon from opening a gate to Hell and freeing Lilith. However, their father escapes as well and gives them the chance they need to kill the Yellow Eyed Demon, before his soul heads to heaven.