Sadie Sink

Ziggy Berman

Emily Rudd

Cindy Berman

Ryan Simpkins

Alice

McCabe Slye

Tommy Slater

Gillian Jacobs

C. Berman / Adult Ziggy

Kiana Madeira

Deena

Benjamin Flores Jr.

Josh

Ted Sutherland

Young Nick Goode

Matthew Zuk

Mayor Will Goode

Olivia Scott Welch

Sam Fraser

Brandon Spink

Young Will Goode

Chiara Aurelia

Sheila

Marcelle LeBlanc

Becky

Eden Campbell

Annie

Michael Provost

Kurt

Drew Scheid

Gary

Jacqi Vene

Joan

Sam Brooks

Arnie

Jordana Spiro

Nurse Mary Lane

Jason Edwards

Sunnyvale Cop

Paul Teal

Young Officer Kapinski

Dylan Gage

Jeremy

Jordyn DiNatale

Ruby Lane

Kevin Waterman

'The Milkman' Harry Rooker

Emily Brobst

Billy Barker

Keil Oakley Zepernick

'Shame Killer' Isaac Milton

Michael Chandler

'The Pastor' Cyrus Miller

Elizabeth Scopel

Sarah Fier

Kenneth Trujillo

EMT

Ashley Zukerman

Sheriff Nick Goode

Julia Rehwald

Kate Schmidt (archive footage)

Fred Hechinger

Simon Kalivoda (archive footage)