Dafne Keen

Sophie Nélisse

Sky Yang

Jhaleil Swaby

Dean

Alissa Skovbye

Grace Friedkin

Percy Hynes White

Michelle Fairley

Nick Frost

Janaya Stephens

Grace's Mom

Lanette Ware

Maya Jackson

Mika Amonsen

Tanner

Stephen Kalyn

Mason Horse Raymore

Troy James

Dead Dean

Cameron Norris

Timmy

Maynuka Sarwar

Sexy Pennywise

Ruth Chiang

Rel's Mom

Julia Dyan-Porter

EMT

Toria Summerville

Old Crone / Dead Ellie

Christine Sahely

Principal Flynn

Mikayla Kong

Asha

Matthew MacCallum

Burnt Mason / Dead Dean / Bloated Jake

Ray Francis

Bandaged Man

Kalie Hunter

Dead Grace

Brandon James Sim

Mr. Craven Doppelgänger

Michael Koras

Tommy

Clayton Scott

Werewolf

Louis Adams

Doctor

Jack Beeston

Carnival Booth Clerk Regg.

Yuliya Stetsko

Student (uncredited)

Liam Chase Trefry

Student (uncredited)