Zach Cooper

Dylan Minnette

Hannah Fairchild

Odeya Rush

Stine

Jack Black

Champ

Ryan Scott Lee

Anna

Ella Wahlestedt

Mr. Rooney

Karan Soni

Davidson

Steven Krueger

Gale

Amy Ryan

Lorraine

Jillian Bell

Officer Brooks

Amanda Lund

Cooper Ryan Lee

Taylor

Halston Sage

Hallway Player

R.L. Stine

Monster

Clare Halstead

Principal Garrison

Keith Arthur Bolden

Coach Carr

Ken Marino

Officer Stevens

Timothy Simons

Screaming Girl

Gabriela Fraile

Jason Davis

Dumb Jock

Caleb Emery

Melissa Eastwood

Erica Marie Sanchez

Screaming Girl

Gabriela Hernandez

Monster #1

Nate Andrade

Monster #2

Sheldon Brown

Monster #3

Melissa Brewer

Monster #4

Marshall Choka

Monster #5

Melissa Cowan

Monster #6

John Deifer

Monster #7

Everett Dixon

Monster

Kevin Galbraith

Monster

Brian Gabriel

Monster

Maryann Gorka

Monster

Devin Hampton

Monster

Rory Healy

Monster

Drew Lamkins

Monster

Vivian Kyle

Monster

Charlie Leach

Monster

Katie Lumpkin

Monster

Larry Mainland

Monster

Lucky Mangione

Monster

Justin Natic

Monster

Josh Phillips

Monster

Mickie Pollock

Monster

Steve Quinn

Monster

Ashleigh Jo Sizemore

Monster

Jeff Tenney

Monster

Jennifer Trudrung

Monster

Ashton Lee Woolen

Monster

Coleman Youmans

Mayor (uncredited)

E. Roger Mitchell