The Billy Clones is what makes everyone in the Shadow Universe head for the hills. When Grim tells the kids and shadows not to open any doors, Billy and his shadow broke the rule by breaking the window of door of his unverse every Billy in the universe attacked the Shadow Universe by going to the Ice Cream Parlor, going down a slide, and joining Mandy and her shadow at Billy's house. For some unknown reason, one of the clones is a giant Billy.

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