Sadie Sink as Ziggy Berman

Emily Rudd as Cindy Berman

Ryan Simpkins as Alice

McCabe Slye as Tommy Slater

Gillian Jacobs as C. Berman / Adult Ziggy

Kiana Madeira as Deena

Benjamin Flores Jr. as Josh

Ted Sutherland as Young Nick Goode

Meghan Packer as TV Anchor

Matthew Zuk as Mayor Will Goode

Olivia Scott Welch as Sam Fraser

Brandon Spink as Young Will Goode

Chiara Aurelia as Sheila

Marcelle LeBlanc as Becky

Eden Campbell as Annie

Michael Provost as Kurt

Drew Scheid as Gary

Jacqi Vene as Joan

Sam Brooks as Arnie

Jordana Spiro as Nurse Mary Lane

Jason Edwards as Sunnyvale Cop

Paul Teal as Young Officer Kapinski

Alex Huff as Mean Sunnyvale Jailer

Dylan Gage as Jeremy

Jayden Griffin as Cool Sunnyvale Camper

Jordyn DiNatale as Ruby Lane

Kevin Waterman as 'The Milkman' Harry Rooker

Emily Brobst as Billy Barker

Keil Oakley Zepernick as 'Shame Killer' Isaac Milton

Michael Chandler as 'The Pastor' Cyrus Miller

Lana Spraley as Shadyside Prisoner #1

Ja'rell Anderson as Shadyside Prisoner #2

Elizabeth Scopel as Sarah Fier

Kenneth Trujillo as EMT

Ashley Zukerman as Sheriff Nick Goode

Julia Rehwald as Kate Schmidt (archive footage)

Fred Hechinger as Simon Kalivoda (archive footage)

Christopher Talbert as Crying camper