Tonight on Supernatural it is making a show killing mistake and it will Jump the Shark by adding a brother they never knew about. Shows that have added relatives suddenly like that have notoriously been cancelled shortly afterwards are Happy Days = Roger Phillips played by Mr Jump Shark himself Ted McGinely, The Brady Bunch = Cousin Oliver and Married with Children = Seven. But knowing Supernatural, I think they will be OK because unlike other shows they are going down that path and they named the episode Jump the Shark.
So watch Supernatural Jump the Shark tonight on The CW at 9p.