He saw Dean in the alleyway attacking someone. Because Dean was "so nice looking," Boris decided Dean would make a perfect recruiter for his nest and so turned Dean into a vampire. Later, Boris sees Dean again, and treats Dean like a friend. He tells Dean that they are both recruiters now. He shows Dean how they draw people in using poetry to attract vampire fans. Once they bring the fans in, they are converted and used to recruit more people. Boris also reveals that he is 600 years old.
Boris tells Dean it wasn't his idea, but his "father's", and promises to give Dean a private tour later. As they are walking, Boris hears a drop of blood leak out of a syringe Dean pulls and stops Dean before it can touch him. As he is restraining Dean, a high pitched noise breaks out and Boris collapses as he, along with all the other vampires of the nest, get a message from the Alpha Vampire. After recovering, he releases all of the vampires to battle Dean. After Dean kills all of the vampires, Boris tells him it's too late and attacks. Dean wins and is found standing over Boris's decapitated body. Once they have Boris's blood, they cure Dean.
In You Can't Handle The Truth, Dean is haunted by the idea that Sam allowed Boris to turn him into a vampire. After falling under Veritas' truth curse, Dean confronts Sam who claims that Dean is wrong which Dean believes as the curse compels everyone to tell the truth. After Veritas reveals that Sam can lie under the curse, he finally admits that he allowed Boris to turn Dean as he knew about the vampire cure and felt it was their only way into the vampire nest.
In The Raid, Boris briefly appears in a flashback along with several other vampires when the British Men of Letters explain to Sam Winchester about their plan to wipe out all of the vampires in America.
Powers and Abilities Edit
Being over 600 years old, Boris was a powerful vampire, and possessed abilities common to his kind.
- Super Strength - He was easily able to overpower Dean and send him flying with just a punch.
- Super Speed - Boris could move much faster than any human.
- Super Agility - He easily escaped from the Winchesters by scaling the sides of a building.
- Super Senses - Boris possessed much enhanced senses, he was able to hear the sound of a drop of blood as it hit the floor behind him.
- Super Stamina - As an vampire, he didn't tire very easily.
- Immortality - Being an vampire, Boris could of lived forever, he was well over 600 years old at the time of his death, and is immune to aging and disease.
- Invulnerability - He couldn't be killed by conventional means.
- Decapitation - Boris could killed by decapitation, as Dean killed him by cutting off his head.
- Dead Man's Blood - He could be incapacitated if injected with dead man's blood.