Jack Black

R.L. Stine

Dylan Minnette

Zach Cooper

Odeya Rush

Hannah Fairchild

Amy Ryan

Gale Cooper

Ryan Lee

Champ

Jillian Bell

Lorraine Conyers

Halston Sage

Taylor

Ken Marino

Coach Carr

Timothy Simons

Officer Stevens

Amanda Lund

Officer Brooks

Steven Krueger

Davidson

Keith Arthur Bolden

Principal Garrison

Karan Soni

Mr. Rooney

R.L. Stine

Hallway Player

Caleb Emery

Dumb Jock

Rory Healy

Monster

Drew Lamkins

Monster

Larry Mainland

Monster

Lucky Mangione

Monster

Jennifer Trudrung

Monster

Ashton Lee Woolen

Monster

E. Roger Mitchell

Mayor (uncredited)

Jason Davis

Cyclist (uncredited)