Once again proving he is the most daring cartoon maker going today, Maxwell Atoms' feature-length movie "Billy & Mandy's Big Boogey Adventure" takes the established continuity of the series and sends it spinning on its own ear, surprising and reconciling opposites like nobody's business.Grim's trial can be readily traced back to Beetlejuice's misdemeanors, but where Beetlejuice was an individual malcontent, Grim is an established entity. Mandy, being Mandy, plays it straight right up until her nightmare scenarios and her eyes misting with tears fearing Billy has become the Kracken's lunch, showing not only Atoms' willing to risk flexing the emotions of a character whose emotions are purely set in stone, but perhaps showing that maybe--just maybe--Mandy really does like Billy, warts and all. Mandy is purely Cartoon Network's greatest cartoon star.Irwin kissing Mandy to revive her is what fans have been waiting for (even if Mandy was asleep), and that Billy lays out what had been accomplished shows a hint of wisdom underneath that imbecile mind. Dementia, heart and a grand sense of macabre fun is what makes the movie go from the get-go.