Overview
When Billy accidentally food-poisons Miss Butterbean, Principal Goodvibes offers Grim the job of substitute teacher, which Grim accepts as now Billy and Mandy have to obey him. Grim sends misbehaving students to the "Detention Dimension", a place of eternal classroom punishment, until only Mandy remains in his class. Grim tricks Mandy into opening a portal and she is dragged into the dimension too. Mandy proves to be more terrifying than Miss Slither, the giant, rattlesnake-like creature in charge of the Detention Dimension, that Mandy escapes the place and takes revenge on Grim by sending him there too.
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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