Overview
When Billy fails an important test, the result of which will go into his permanent record, he asks Grim to magically alter his grade from an "F" to an "A"; as Grim reluctantly changes the grade, Billy becomes a genius, but reality is thrown completely off balance. Mandy and Grim go back in time to stop the past Grim from helping Billy, but it does not work. They keep going back in time to different epochs, each time meeting another Grim, eventually trying to stop Billy's ancestors from conceiving him, but nothing works. After meeting Billy's distant dinosaur relative, the episode ends abruptly as Grim wonders what the end of this could be.
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7 - 1Everything Breaks June 06, 2006
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7 - 2The Show that Dare Not Speak Its Name June 06, 2006
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7 - 3The Secret Snake Club vs P.E. October 20, 2006
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7 - 4King Tooten Pooten October 20, 2006
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7 - 5Billy Gets an "A" March 02, 2006
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7 - 6Yeti or Not, Here I Come March 02, 2007
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7 - 7Nergal's Pizza March 09, 2007
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7 - 8Hey, Water You Doing? March 09, 2007
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7 - 9Company Halt March 16, 2007
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7 - 10Anger Mismanagement March 16, 2007
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7 - 11Waking Nightmare March 23, 2007
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7 - 12Beware of the Undertoad March 23, 2007
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7 - 13The Greatest Love Story Ever Told Ever April 06, 2007
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7 - 14Detention X April 06, 2007
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7 - 15Billy and Mandy Moon the Moon May 28, 2007
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7 - 16Dracula Must Die! September 21, 2007
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7 - 17Short Tall Tales September 21, 2007
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7 - 18Nigel Planter and the Order of the Peanuts September 28, 2007
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7 - 19The Incredible Shrinking Mandy September 28, 2007
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7 - 20El Dia De Los Muertos Estupidos November 09, 2007
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7 - 21Heartburn November 09, 2007