Spencer Klein
Arnold (voice) (42 eps)
Francesca Marie Smith
Helga Pataki (voice) (42 eps)
Jamil Walker Smith
Gerald Johanssen (voice) (42 eps)
Olivia Hack
Rhonda Wellington Lloyd (voice) (42 eps)
Anndi McAfee
Phoebe Heyerdahl (voice) (42 eps)
Justin Shenkarow
Harold Berman (voice) (42 eps)
Blake McIver Ewing
Eugene Horowitz (voice) (42 eps)
Dan Castellaneta
Grandpa Phil (voice) (42 eps)
Brian Doyle-Murray
Lasombra (1 eps)
Davy Jones
Himself (1 eps)