<P> 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 . </P> <P> 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 9, 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 . Reruns can currently be seen on Boomerang . </P> <P> The series is centered around the exploits of Billy (voiced by Richard Steven Horvitz), a completely idiotic and happy - go - lucky boy; Mandy (Grey DeLisle), a cynical and merciless girl, and Grim (Greg Eagles), the Grim Reaper who is often tormented by the duo . After cheating at a limbo match against Grim (in retaliation for putting the limbo rod too low for them to go under), he is enslaved in a permanently unwanted friendship with the children . Grim is miserable in the first days of his servitude, and even fantasizes about killing them multiple times . However, as the time passes, he gradually adapts to the new life, and even grows to care for Billy and Mandy, if only somewhat . Despite this, he retains a love - hate relationship with the two and desires to eventually break free from his servitude . </P> <P> Billy and Mandy use Grim's supernatural abilities and powers to venture into supernatural locations or environments, such as the Underworld, or the Netherworld, inhabited by an assortment of grotesque monstrous beasts . The pair also use Grim's enormously strong supernatural abilities or ties with a number of beastly characters to achieve goals or desires for themselves, often with twisted results . Famed fictional monsters including Dracula, the Wolfman, and the bogeyman are also comically depicted in the series . </P>

Who plays the grim reaper in billy and mandy