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

Meghan Packer TV Anchor

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

Alex Huff Mean Sunnyvale Jailer

Dylan Gage Jeremy

Jayden Griffin Cool Sunnyvale Camper

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

Lana Spraley Shadyside Prisoner #1

Ja'rell Anderson Shadyside Prisoner #2

Elizabeth Scopel Sarah Fier

Kenneth Trujillo EMT

Ashley Zukerman Sheriff Nick Goode

Julia Rehwald Kate Schmidt (archive footage)

Fred Hechinger Simon Kalivoda (archive footage)

Christopher Talbert Crying camper