Gretel

Meli Povenmire

Kevin

Michael Cimino

Hamster

Beck Bennett

Fred (voice)

Joey King

Dave

Matt Jones

Carolina

Carolina Ravassa

Bailey (voice)

Priah Ferguson

Tobor

Alex Estrada

Veronica Hill (voice)

Liza Koshy

The Earworm

Adam Rose

Hiromi (voice)

Romi Dames

Professor Exclamation (voice)

Phil LaMarr

Nordle (voice)

Pamela Adlon

Lyle (voice)

Brock Powell

Lauren (voice)

Alyson Stoner

Ms. Weems (voice) / Librarian (voice)

Cree Summer

The Luchador (voice) / Luchador (voice)

Carlos Alazraqui

Otter (voice)

Dee Bradley Baker

The Imposter (voice) / Arthouse (voice)

Diedrich Bader

Rodney Thunderpants (voice)

James Adomian

Mr. Chabner / Van Dyke (voice)

Casey Hamilton

Roman (voice)

Michael-Leon Wooley