Dean’s Ultimatum to Sam for the End of the World | Supernatural

“I’m the only one who can do this, Dean.” Season 4 Episode 21: When the Levee Breaks WATCH NOW: https://www.warnerbros.com/tv/superna... Subscribe now:    / @supernaturalseries   This is the official “SUPERNATURAL” channel! Join the Winchester brothers on this spooky road trip as they save people, hunt things, and handle the family business. #Supernatural #SamWinchester #DeanWinchester #Castiel #JaredPadalecki #JensenAckles #MishaCollins #EricKripke