33. The Gentlemen, 'Buffy the Vampire Slayer'
Faith, Angelus, Spike, Drusilla, Glory, the Mayor, Dark Willow: Joss Whedon's influential horror-action-teen-drama hybrid had no shortage of memorable baddies, big and otherwise. But sometimes one episode is all it takes to cement your place in the horror hall of fame, and that's the deal with the Gentlemen — the smiling, silent, spectral stars of the landmark episode "Hush." Other Buffy villains may have wreaked more havoc or broken more hearts, but these entities were genuine nightmare fuel.