Adam Milligan (Ghoul)

Ghoul Adam is the main antagonist together with his sister in series tv Supernatural in season 4.

History
Not if know very only the life of this ghoul unnamed and of his sister after what your father dead for John Winchester as revenge he and sister decided kill all connected the John Winchester who could continue with life.

Jump the Shark
After death your father, the Ghouls decide revenge of responsible for death from your father, them begins killings to all linked to John Winchester. Them kill Joe Barton, Kate Milligan and Adam Milligan; this Ghouls called for cell phone of Adam for John more Dean attended the cell phone informing which John death, so the Ghouls already had resolved would kill Sam and Dean Winchester after of discover what was son of John, the same Ghoul used appeareance of Adam for if to approach of Winchester to killing them.

In scene of crime Sam and Dean Winchester was investigating about what John was hunting, Dean find something in sewer who was Kate Milligan (Ghoul) who it escape after Sam and Dean if separate for discover anything who could help, after Dean discovers the true body of Adam and Kate, after Ghoul Adam hit in Sam, after which him and your sister tie him and also your blood after while them talk, Dean Winchester appeared and gave an shoot in Kate Milligan (Ghoul) after Sam warn the Dean which them are Ghouls so he catch of Ghoul Kate killing her after Ghoul Adam graps Dean them has a fight what ends when Dean attack Ghoul Adam in head killing he.

After Sam and Dean burn body of real Adam Milligan giving a for he.