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
Christian Bridges
Fun Shadyside Football Player
Matthew Zuk
Mayor Will Goode
Jeremy Ford
Peter
Jaime Matthis
Shadyside Player
Danyon Huntington
Sunnyvale Skullmask
Elizabeth Scopel
Sarah Fier
Tayla Rogers
The Babysitting Twin
Maya Rogers
The Babysitting Twin
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
Meghan Packer
TV Reporter #2
Gillian Jacobs
C. Berman (voice)
Sadie Sink
Ziggy Berman (uncredited)