Billy & Mandy's Jacked-Up Halloween Jack, a headless prankster from Grim's past, uses Billy to steal Grim's scythe so he can destroy Grim and take over the world with demons from the Netherworld. Details Casts Galleries Posters Title Billy & Mandy's Jacked-Up Halloween Release Date 2003-10-31 Runtime 00 Hours 22 Minutes Genres Animation Adventure Comedy Horror Production Companies Cartoon Network Studios Production Countries United States of America Grey DeLisle... Mandy/Granny/Cowgirl (voi... Greg Eagles... Grim/Spirit/Knight (voice... Richard Steven Horvitz... Billy/Guy (voice)... Wayne Knight... Jack (voice)... Vanessa Marshall... Irwin/Toilet Paper Woman ... Billy West... Giant Pumpkin/Lumber Jack... Original Size (1280x720) Original Size (568x800)