In one of Buffy's more difficult battles, an Apocalypse Cult called the Sisterhood of Jhe attempted to open the Hellmouth, producing a four-headed, dragon-like demon in the library who's purpose was to begin the process of sucking the Earth down to Hell. Fortunately, Buffy, Giles and Willow were able to defeat the Hellmouth Demon before it could bring the end of the world.

Episode: The Zeppo
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