Overview
After Grim's robe comes out of the washing machine, Billy and Mandy find Thromnambular, a talking skull with ruby eyes and a number nine imprinted on his forehead. Grim tells them that the skull is a magical artifact imprisoned on Earth that must grant his nine wishes to be free. When Mandy asks Grim why he has not used any of the wishes, Grim tells her that the skull will corrupt the wishes and end up affecting the wisher.
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4 - 1The Secret Snake Club February 25, 2005
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4 - 2He's Not Dead, He's My Mascot April 01, 2005
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4 - 3Hog Wild April 01, 2005
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4 - 4The Bad News Ghouls April 08, 2005
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4 - 5The House of No Tomorrow April 08, 2005
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4 - 6Happy Huggy Stuffy Bears April 15, 2005
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4 - 7The Secret Decoder Ring April 15, 2005
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4 - 8Wild Parts June 03, 2005
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4 - 9The Problem with Billy June 03, 2005
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4 - 10Wishbones June 10, 2005
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4 - 11Dream Mutt June 17, 2005
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4 - 12Scythe for Sale June 17, 2005
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4 - 13Jeffy's Web June 24, 2005
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4 - 14Irwin Gets a Clue June 24, 2005
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4 - 15Duck! June 24, 2005
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4 - 16Aren't You Chupacabra to See Me? June 24, 2005
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4 - 17Zip Your Fly June 27, 2005
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4 - 18Puddle Jumping June 27, 2005
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4 - 19Runaway Pants June 28, 2005
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4 - 20Scythe 2.0 June 28, 2005
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4 - 21The Firebird Sweet June 29, 2006
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4 - 22The Bubble with Billy June 29, 2006
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4 - 23Billy Idiot June 30, 2005
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4 - 24Home of the Ancients June 30, 2005