Tulip Olsen

Ashley Johnson

Min-Gi

Johnny Young

Ryan

Sekai Murashige

Sad-One (voice) / Toad / Bully 3 (voice)

Owen Dennis

Kez

Minty Lewis

Glad-One (voice) / Mask Monster (voice) / The Dean (voice)

Jeremy Crutchley

Megan Olsen (voice)

Audrey Wasilewski

Grace (voice) / Voice 3 / Mail Lady (voice)

Kirby Howell-Baptiste

Simon (voice) / Voice 4 / Playbill

Kyle McCarley

Pig Baby

J.K. Simmons

Jesse (voice) / Richard Trundleshank (voice) / Bully 2 (voice)

Robbie Daymond

Judge Morpho

Margo Martindale

Hazel (voice)

Isabella Abiera

The Cat (voice)

Kate Mulgrew

Atticus (voice)

Ernie Hudson

Agent Mace (voice)

Ben Mendelsohn

Agent Sieve (voice)

Bradley Whitford

Randall / Balloon Randall (voice)

Rhys Darby

Comedy Mask (voice) / Goblin / Tusk Creature

Keith Ferguson

Friend (voice) / Kevin / Turtle Guard (voice)

Justin Michael

Monster Atticus (voice)

Dee Bradley Baker

Nate (voice)

Justin Felbinger

Mikayla (voice) / Mikayla / Dolphin Handler

Reagan Gomez-Preston

Little Badger Boy / Badger Mother (voice) / Nancy (voice)

Lindsay Katai

Aloysius (voice) / Alrick (voice)

Matthew Rhys