The Grim Adventures of the Kids Next Door is a half-hour TV special featuring a crossover between Codename: Kids Next Door and The Grim Adventures of Billy and Mandy. Cartoon Network officially announced it on February 16, 2007, although staff confirmed it on December 8, 2006. The crossover aired on November 11, 2007.
There is a extended version of the special, the scene when the Delightful Reaper explodes, several characters coming out of it is long, during the scene the characters (Johnny Bravo and Lazlo and Lumpus from Camp Lazlo) were seen coming out of the Delightful Reaper. The extended version is unconfirmed and lost, it was hard to find the extended version of the special.