Twenty-five years ago, Sam Winchester (series star JARED PADALECKI) and Dean Winchester (series star JENSEN ACKLES) lost their mother to a mysterious and demonic supernatural force. Subsequently, their father raised them to be soldiers. He taught them about the paranormal evil that lives in the dark corners and on the back roads of America ... and he taught them how to kill it. Now the Winchester brothers crisscross the lonely and mysterious back roads of the country in their '67 Chevy Impala hunting down every evil supernatural force they encounter along the way.

In the fourth season premiere, it's been four months since Dean was dragged away by the hounds of Hell, the result of a deal he made with the Crossroads Demon in exchange for his brother's life. Now, Dean wakes up in a pine box. He's been freed from Hell, but he doesn't know how or why. He has a joyful reunion with Sam and fellow demon hunter Bobby (recurring guest star JIM BEAVER), but it isn't long before the three start to really wonder what exactly pulled Dean from Hell -- and what it will want in return.