The Grim Adventures of Billy and Mandy Wiki
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The Grim Adventures of Billy and Mandy Wiki

Billy's former self is an idiotic shadow of Billy's. He appears in the episode 5:00 Shadows. While Mandy's shadow is sweet, Billy's shadow is even more unintelligent than the normal Billy. Apparently he can't speak human language because he was only heard talking in seal language. He wears Billy's same clothes except that he does not sport Billy's hat but instead, a football helmet.

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