The Grim Adventures of Billy & Mandy is an American animated television series created by Maxwell Atoms for Cartoon Network.
The segments were spun-out into their own series on June 13, 2003 (the 2003-2004 episodes were originally for Grim & Evil), and continued to air until November 9, 2007.
A spin-off film, titled Underfist: Halloween Bash, aired on October 12, 2008.
The episode "Billy & Mandy Moon the Moon" was part of Cartoon Network's "Invaded" event, which included other shows such Foster's Home for Imaginary Friends, Ed, Edd n Eddy, My Gym Partner's a Monkey, and Camp Lazlo, with Billy & Mandy being the last to air.
The shorts revolved around Billy's birthday and aired on "The Grim and Courage Hour", an hour-long block of episodes from The Grim Adventures of Billy & Mandy and Courage the Cowardly Dog.