Original: The Grim Adventures of Billy & Mandy is an American animated television series that originally aired on Cartoon Network. Having originally aired on Grim & Evil in 2001, the show aired (Under the The Grim Adventures of Billy and Mandy title) on June 13, 2003 and ended on October 12, 2008 with the finale Underfist.
Simplified: The Grim Adventures of Billy & Mandy is an American animated television series created by Maxwell Atoms, that originally aired on Cartoon Network, the show aired on June 13, 2003 and ended on October 12, 2008 with the finale Underfist.