The Grim Adventures of Billy & Mandy (also known as Billy & Mandy) is an American animated television series created by Maxwell Atoms for Cartoon Network, and is the 14th of the network's Cartoon Cartoons (albeit on when it was part of Grim & Evil, due to the Cartoon Cartoons brand being temporarily discontinued earlier in June 2003; the show itself is considered by some to still be a Cartoon Cartoon show regardless). It follows two children named Billy—a slow-witted happy-go-lucky boy—and Mandy—his dark and cynical best friend—who, after winning a limbo game to save Billy's pet hamster, gain the mighty Grim Reaper as their best friend in eternal servitude and slavery.
Billy & Mandy began as a series of segments on Grim & Evil, from which it was spun-off, along with Evil Con Carne, on August 24, 2001. The show ran as a separate series from June 13, 2003 to November 11, 2007, but a telefilm, titled Underfist: Halloween Bash, aired on October 12, 2008, officially bringing the series to a close. In addition to the episodes, three movies, two special episodes, and nineteen shorts were made, with 3 award wins for the series as a whole. Billy & Mandy has also been made into a video game as well as various licensed merchandise. After the series ended on Cartoon Network, reruns currently aired on Boomerang from time to time.