Oskar Can't Read?

Spencer Klein

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)

Justin Shenkarow

Harold Berman (voice)

Dan Castellaneta

Grandpa Phil (voice)

Ben Diskin

Eugene Horowitz (voice)

Christopher Walberg

Stinky Peterson (voice)

Dom Irrera

Ernie Potts (voice)

Mary Scheer

Suzie Kokoshka (voice)

Jordan Warkol

Chocolate Boy / Jamie (voice)

Baoan Coleman

Oskar Kokoshka (voice)

Laraine Newman

Librarian / Kid (voice)