Helga Pataki (voice)
Gerald Johanssen (voice)
Grandpa Phil (voice) / Grandpa Phil / Reporter (voice)
Harold Berman (voice) / Harold Berman(voice)
Phoebe Heyerdahl (voice) / Phoebe Heyerdahl / Joy (voice)
Stinky Peterson (voice) / Stinky Peterson / Kyle (voice)
Arnold (voice) / Ludwig (voice)
Arnold (voice)
Rhonda Wellington Lloyd (voice) / Rhonda Wellington Lloyd / Mary (voice)
Arnold (voice) / Wolfgang (voice)
Sid (voice) / Sid / Robert (voice)
Eugene Horowitz (voice)
Brainy (voice) / Brainy (voice; uncredited)
Grandma Gertie (voice) / Miss Slovak (voice)
Miriam Pataki (voice) / Mrs. Berman (voice)
Oskar Kokoshka (voice) / Oskar Kokoshka / Caesar (voice)
Big Bob Pataki (voice) / Maurice / Director (voice)
Ernie Potts (voice) / Stinky's Father (voice)
Mr. Simmons (voice) / Mr. Simmons (voice; uncredited)
Principal Wartz (voice) / Mr. Berman (voice)
Eugene Horowitz (voice) / Eugene Horowitz / Kid (voice)
Mr. Hyunh (voice) / Oskar Kokoshka (voice)
Mr. Green (voice) / Mr. Green / Judge (voice)
Curly Gammelthorpe (voice)
