The much rumored third Winchester brother that will be appearing in an upcoming episode of Supernatural has finally been cast!  According to exclusive findings by TV Guide, Threshold's Jake Abel will be playing the previously unknown sibling.

Abel has been cast on Supernatural as Adam Milligan, an 18-year-old who Sam and Dean meet in the upcoming episode, "Jump the Shark."  We find out that Adam is the outcome of a little action papa John got during one of his demon hunts.

Now the question is.  Will Adam actually be their brother or is this all some sort of demonic trick?  That sure would keep Supernatural fans happy.

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