The Grim Adventures of Billy & Mandy didn't appear IN anything.
It was always a stand alone show on Cartoon Network.
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No they arent they are just friends in a wierd way
The Miley and Mandy Show - 2008 Special Guest Justin Gaston 2-2 was released on: USA: 12 January 2009
His first wife is Cindy Smith, who divorced Billy in 1991. She had two kids conceived after the divorce and they were given to Billy Ray. Those children were Miley and Christopher Cyrus.
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He worked on The Tracy Ullman Show and helped to develop The Simpsons who first appeared on that show .