Devon Werkheiser Casper / Casper's Shadow (voice) Brett DelBuono Jimmy (voice) Jim Belushi Alder (voice) Bob Saget Dash (voice) John DiMaggio Stinkie / Frankengymteacher (voice) Billy West Fatso / Figurehead (voice) Dan Castellaneta Stretch (voice) Kevin Michael Richardson Kibosh (voice) Matthew Underwood Thatch (voice) Christy Carlson Romano Mantha (voice) Candi Milo Mickey (voice) Nika Futterman Monaco (voice) Kendre Berry Ra (voice) Debi Derryberry Banana Lady / History Teacher / Additional Voices (voice) Pat Fraley Scare Center Host 1 / Wolfie / Narrator / Werewolf / Additional Voices (voice) Scott Menville Punk Kid / Scare Center Host 2 / Pumpkinhead / Brainiac / Pool Guy / Hunchback / Additional Voices (voice) Maurice LaMarche Pirate / Thurdigree Burns (voice) Kevin McDonald Parrot (voice) Terri Douglas Fish Boy / Drip / Additional Voices (voice) John Kassir P.A. Voice / Additional Voices (voice) Phyllis Diller Aunt Spitzy (voice) Danny Cooksey Additional Voices (voice) Fred Tatasciore Additional Voices (voice)