|Actor||Joseph D. Reitman|
|Dates||1400's - 2011 (killed by Dean Winchester)|
|Episode(s)||6.05 Live Free or Twihard|
When Robert recruits Kristen, he brings her to Boris. Boris later sees Dean in an alley and, after telling him he's pretty, he attacks and feeds him his blood, turning Dean into a vampire. He wants to use Dean as a "recruiter" because Dean is attractive and can potentially lure in more young women for him to turn. Because he turned Dean, Dean needs Boris' blood in order to cure himself of vampirism. Dean infiltrates the vampires' nest where he meets Boris and Boris explains things to him. However, when Dean tries to inject him with dead man's blood, Boris senses it when a single drop of blood drips from the needle and overpowers Dean until all of the vampires are overpowered by a vision from the Alpha Vampire. Dean quickly recovers and starts slaying all the vampires in the nest, so Boris lets out the changed girls to fight. Dean slays all the vampires then faces against Boris. Dean wins and kills Boris and using his blood, Sam and Samuel are able to turn Dean back to human.