You can watch Supernatural Season 12 Episode 12 (Stuck in the Middle (With You)) S12E12 Online Streaming. Full online here at viralshow.info features links to all your favorite TV shows. Supernatural S12E12 Stream on viralshow.info largest online tv episode database. Updated everyday. Summary: Mary asks Sam, Dean and Castiel for help on a case she’s working but neglects to mention the British Men of Letters are involved. When Mary is double crossed, everything is revealed.