Based on the popular Cartoon Network show of the same name, Billy, Mandy & Grim discover that Grim's trunk has been raided, and that Mojo balls have been released, causing people to start random fights with each other. Billy, Mandy and Grim decide to join in, in the hopes of finding the culprit behind this whole mess.
Features the first appearances of recurring Will Vinton characters Herb and Rex.