Vampires have been a presence on "Supernatural" since the first season -- a couple of years before the "Twilight" craze beganh. Back in Season 6, "Supernatural" did an episode that parodied the current romantic vampire mythology, propagated by shows like "True Blood" and "The Vampire Diaries" as well as the film series.
With all of the vampire shows and movies out there, we thought we'd help you brush up on the rules of vampire mythology in the "Supernatural" world. Here are the six things to remember going into Season 8:
1. Their teeth aren't pretty. Unlike the two sharp fangs from the "Twilight" series and most vampire TV shows, the "Supernatural" vampires look like something out of your shark week nightmare.
2. Humans are turned into vampires by ingesting vamp blood. In Season 6, Dean was turned into a vampire when a vampire forced him to drink his blood. In "The Vampire Diaries," a person must die with vampire blood in her system and then feed on a human to turn. "True Blood" humans have to be bitten and drained of almost all their human blood before feeding on vampire blood. It's not such a process in "Supernatural."
3. Dead man's blood weakens them. Once injected
with it, they're incapacitated for a bit... but not for long.
4. There are a few ways to kill them. Vampires can die by having their heads cut off. In Season 6, Castiel also killed the vampire Lenore by touching her head. He's a boss like that.
5. There is a cure. Unlike some of the other major pop-culture vampires, "Supernatural" vampires can be cured of their condition -- but it isn't easy.
6. Finally, all vampires are ruled by the Alpha. The Alpha vampire is the very first vampire.