Hey Arnold!

Francesca Marie Smith
Helga Pataki (voice)

Jamil Walker Smith
Gerald Johanssen (voice)

Dan Castellaneta
Grandpa Phil (voice) / Animal Control Officer (voice) / Grandpa Phil / Nolo (voi...

Justin Shenkarow
Harold Berman (voice) / Harold Berman(voice) / Harold Berman / Iggy (voice) / Ha...

Anndi McAfee
Phoebe Heyerdahl (voice) / Phoebe Heyerdahl / Kid #2 / Phoebe Heyerdahl / Woman ...

Christopher Walberg
Stinky Peterson (voice) / Stinky Peterson / Kyle (voice) / Stinky Peterson / Bra...

Phillip Van Dyke
Arnold (voice) / Ludwig (voice)

Spencer Klein
Arnold (voice)

Olivia Hack
Rhonda Wellington Lloyd (voice) / Rhonda Wellington Lloyd / Mary (voice)

Lane Toran
Arnold (voice) / Wolfgang (voice) / Arnold (singing voice) / Wolfgang / French B...

Sam Gifaldi
Sid (voice) / Sid / Robert (voice) / Billy (voice)

Blake McIver Ewing
Eugene Horowitz (voice)

Tress MacNeille
Grandma Gertie (voice) / Miss Slovak (voice) / Grandma Gertie / Miss Slovak (voi...

Kath Soucie
Miriam Pataki (voice) / Mrs. Berman (voice) / Mrs. Vitello (voice) / Miriam Pata...

Maurice LaMarche
Big Bob Pataki (voice) / Big Bob Pataki / Moderator (voice) / Maurice / Director...

Dom Irrera
Ernie Potts (voice) / Stinky's Father (voice) / Ernie Potts / Paper Man (voice) ...

Dan Butler
Mr. Simmons (voice) / Mr. Simmons (voice; uncredited) / Mr. Simmons / Dispatcher...

David Wohl
Principal Wartz (voice) / Mr. Berman (voice) / Mr. Berman / Bus Driver (voice) /...

Ben Diskin
Eugene Horowitz (voice) / Eugene Horowitz / Kid (voice)

Baoan Coleman
Mr. Hyunh (voice) / Oskar Kokoshka (voice)