The Grim Adventures of Billy & Mandy/Jimmy Neutron

Cast

 * Zim (from Invader Zim) as Jimmy Neutron
 * Irwin as Carl Wheezer
 * Billy as Sheen Estevez (both are dumb)
 * Mindy as Cindy Vortex
 * Mandy as Libby
 * Gladys as Judy Neutron
 * Harold as Hugh Neutron
 * Grim as King Goobot V
 * Mandark (from Dexter's Laboratory) as Ooblar