Season 5 Episode 13 episode 13 Supernatural Season 5 Episode 13 "Back to the Future II": Promo Pic 14.01.2010. @ 23:48 VickiCastro Here is a great spoiler pic of the upcoming episode, when Dean and Sam travel back in time to prevent their parents' deaths. Methinks Dean is looking into the face of a young Big Daddy Winchester. Your thoughts? Thanks to LilMissX for the photo.