Dan Castellaneta
Earthworm Jim / Grim Reaper / Turns-His-Eyes-Inside-Out Boy / Evil Jim / Abraham Lincoln / Japius / Stock Broker
Jeff Bennett
Peter Puppy / Narrator / Hamsternator / Neighbor / Thug #1 / Billy's Dad / President / Therapist / Great Worm Spirit
Jim Cummings
Psy-Crow / Whooping Cough Boy / Zantor / Bird / Johnny Dactyl / Bob the Killer Goldfish / Number One / Number Two / Sword of Righteousness / Walter / Cuban Band Leader / Santa Claus
Kath Soucie
Princess What's-Her-Name / Cody / Malice The Dog / Billy / Johnny Dactyl's Mom / Little Girl / Perpsichore
Charlie Adler
Professor Monkey-For-A-Head / Rudolph the Red-Nosed Reindeer / Little Boy / Doorman of the Gods / Taxidermist
Edward Hibbert
Evil the Cat
Andrea Martin
Queen Slug-For-A-Butt / Mrs. Bleverage
John Kassir
Snott / Henchrat