Hey Arnold!

Francesca Marie Smith

Helga Pataki (voice)

Jamil Walker Smith

Gerald Johanssen (voice)

Dan Castellaneta

Grandpa Phil / Judge (voice)

Justin Shenkarow

Harold Berman / Robert (voice)

Anndi McAfee

Phoebe Heyerdahl / Clerk (voice)

Christopher Walberg

Stinky Peterson (voice; uncredited)

Phillip Van Dyke

Ludwig (voice)

Spencer Klein

Arnold (voice)

Olivia Hack

Rhonda Wellington Lloyd / Mary (voice)

Lane Toran

Arnold (singing voice)

Sam Gifaldi

Sid / Robert (voice)

Blake McIver Ewing

Eugene Horowitz (voice)

Craig Bartlett

Big Man (voice)

Tress MacNeille

Grandma Gertie (voice)

Kath Soucie

Lunch Lady (voice)

Steve Viksten

Oskar Kokoshka / Stagehand (voice)

Maurice LaMarche

Abner (voice)

Dom Irrera

Ernie Potts / Old Man (voice)

Dan Butler

Mr. Simmons / Publisher (voice)

David Wohl

Principal Wartz / Announcer (voice)