Young Sam Winchester 14-16 was hunting with Dean and their Dad. Dean messes up and gets hurt but Dad assumes it's Sam's fault. Tells Sam that he's not a real hunter and that he's in the way. Sam leaves to prove that he is just as good. Dean and John look for him but can't find him. They than figure out it's much harder to hunt without a genius like Sam doing the research and strategizing. They hear stories from other hunters about Sam. Sam is currently on a warpath and has become as other hunter's describe him "a vicious little shit." and is taking done monster after monster by himself. Sam my had never been as physically strong as John or Dean and is scrawny but what he lacks in strength he makes up for in brains and speed. Other hunters are fighting to find him so they have an apprentice of sorts but John and Dean want him back.