Supernatural (TV series)/Recap/S03/E07 Fresh Blood

Season 3, Episode 7:

Fresh Blood
Gordon has broken out of jail and seeks out Bela in order to get information on the location of the Winchester Brothers. As he zeros in on their location, Dean and Sam hunt down a vampire who is turning young blonds by offering vampire blood as the hottest new drug. Gordon comes into his path but gets turned, leaving the brothers to kill him.

Tropes

 * And Then John Was a Zombie
 * Hey, It's That Guy!: Hey look, Harmony is still a vampire!