Sadie Sink

Character: Ziggy Berman

Emily Rudd

Character: Cindy Berman

Ryan Simpkins

Character: Alice

McCabe Slye

Character: Tommy Slater

Gillian Jacobs

Character: C. Berman / Adult Ziggy

Kiana Madeira

Character: Deena

Benjamin Flores Jr.

Character: Josh

Ted Sutherland

Character: Young Nick Goode

Meghan Packer

Character: TV Anchor

Matthew Zuk

Character: Mayor Will Goode

Olivia Scott Welch

Character: Sam Fraser

Brandon Spink

Character: Young Will Goode

Chiara Aurelia

Character: Sheila

Marcelle LeBlanc

Character: Becky

Eden Campbell

Character: Annie

Michael Provost

Character: Kurt

Drew Scheid

Character: Gary

Jacqi Vene

Character: Joan

Sam Brooks

Character: Arnie

Jordana Spiro

Character: Nurse Mary Lane

Jason Edwards

Character: Sunnyvale Cop

Paul Teal

Character: Young Officer Kapinski

Alex Huff

Character: Mean Sunnyvale Jailer

Dylan Gage

Character: Jeremy

Jayden Griffin

Character: Cool Sunnyvale Camper

Jordyn DiNatale

Character: Ruby Lane

Kevin Waterman

Character: 'The Milkman' Harry Rooker

Emily Brobst

Character: Billy Barker

Keil Oakley Zepernick

Character: 'Shame Killer' Isaac Milton

Michael Chandler

Character: 'The Pastor' Cyrus Miller

Lana Spraley

Character: Shadyside Prisoner #1

Ja'rell Anderson

Character: Shadyside Prisoner #2

Elizabeth Scopel

Character: Sarah Fier

Kenneth Trujillo

Character: EMT

Ashley Zukerman

Character: Sheriff Nick Goode

Julia Rehwald

Character: Kate Schmidt (archive footage)

Fred Hechinger

Character: Simon Kalivoda (archive footage)

Christopher Talbert

Character: Crying camper