Kiana Madeira
Deena

Olivia Scott Welch
Samantha Fraser

Benjamin Flores Jr.
Josh

Julia Rehwald
Kate

Fred Hechinger
Simon

Maya Hawke
Heather

Charlene Amoia
Rachel Thompson / Sunnyvale Customer

David Thompson
Ryan Torres

Noah Bain Garret
Skull Mask

Darrell Britt-Gibson
Martin

Ashley Zukerman
Nick Goode

Jana Allen
TV Reporter #1

Matt Burke
Football Coach

Matthew Zuk
Mayor Will Goode

Elizabeth Scopel
Sarah Fier

Jordana Spiro
Mrs. Lane

Diane Sellers
Check In Nurse

Eric Mendenhall
Nurse Beddy

Todd Allen Durkin
Officer Kapinsky

Jordyn DiNatale
Ruby Lane

Lloyd Pitts
Nightwing Killer

Kevin Waterman
'The Milkman' Harry Rooker

Emily Brobst
Billy Barker

Keil Oakley Zepernick
'Shame Killer' Isaac Milton

Michael Chandler
'The Pastor' Cyrus Miller

Lacy Camp
Mrs. Fraser

Gillian Jacobs
C. Berman (voice)

Sadie Sink
Ziggy Berman (uncredited)