The Grim Adventures of Billy and Mandy Wiki

The Bad Book

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The bad book
The Bad Book is an Underworld handbook not meant for the eyes of mortals.


Bad book pages

When Billy read it, he becomes possessed by Yog-Sothoth

Billy then stole The Reaper's Scythe to summon Yog-Sothoth into the world. He was ultimately stopped by Grim, Mandy, and Hoss Delgado

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