What's Opera, Arnold?

Phillip Van Dyke

Arnold (voice)

Francesca Marie Smith

Helga Pataki (voice)

Jamil Walker Smith

Gerald Johanssen (voice)

Olivia Hack

Rhonda Wellington Lloyd (voice)

Anndi McAfee

Phoebe Heyerdahl (voice)

Christopher Walberg

Stinky Peterson (voice)

Justin Shenkarow

Harold Berman(voice)

Ben Diskin

Eugene Horowitz (voice)

Maurice LaMarche

Sam Gifaldi

Sid (voice)

Adam Wylie

Curly Gammelthorpe (voice)

Lacey Chabert

Ruth P. McDougal (voice)

Lane Toran

Arnold (singing voice)

Craig Bartlett

Brainy / Mr. Packenham (voice)