Ashley Johnson

The Steward (voice) / Tulip Olsen (voice) / Mom / Girl (voice) / Mirror Tulip (voice) / Lake (voice) / Mirror Tulip "MT" (voice) / Popcorn (voice)

Owen Dennis

TV Jingle (voice) / Cross-Eyed Duck / Talking Skeleton (voice) / Toad / Bully 3 (voice) / Sad-One (voice) / Toad / Spells Wizard / Bear (voice) / Greige / Giant (voice) / Pencil People (voice) / Frank (voice)

Kirby Howell-Baptiste

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

Jeremy Crutchley

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

Kyle McCarley

Simon (voice) / Voice 4 / Playbill / Spotlight / Tragedy Mask (voice)

Isabella Abiera

Hazel (voice)

Johnny Young

Min-Gi (voice)

Sekai Murashige

Ryan (voice)

Robbie Daymond

Fyodor / Apex Raider 2 (voice) / Richard Trundleshank (voice) / Jesse (voice) / Bully 2 (voice)

Kate Mulgrew

The Cat (voice)

Ernie Hudson

Atticus (voice)

Ben Mendelsohn

Agent Mace (voice)