Jack Black character R.L. Stine
Dylan Minnette character Zach Cooper
Odeya Rush character Hannah Fairchild
Amy Ryan character Gale Cooper
Ryan Lee character Champ
Jillian Bell character Lorraine Conyers
Halston Sage character Taylor
Ken Marino character Coach Carr
Timothy Simons character Officer Stevens
Amanda Lund character Officer Brooks
Steven Krueger character Davidson
Keith Arthur Bolden character Principal Garrison
Karan Soni character Mr. Rooney
R.L. Stine character Hallway Player
Caleb Emery character Dumb Jock
Gabriela Hernandez character Screaming Girl
Nate Andrade character Monster
Sheldon Brown character Monster
Melissa Brewer character Monster
Marshall Choka character Monster
Melissa Cowan character Monster
John Deifer character Monster
Everett Dixon character Monster
Brian Gabriel character Monster
Kevin Galbraith character Monster
Maryann Gorka character Monster
Clare Halstead character Monster
Devin Hampton character Monster
Rory Healy character Monster
Drew Lamkins character Monster
Vivian Kyle character Monster
Charlie Leach character Monster
Katie Lumpkin character Monster
Larry Mainland character Monster
Lucky Mangione character Monster
Justin Natic character Monster
Josh Phillips character Monster
Mickie Pollock character Monster
Steve Quinn character Monster
Ashleigh Jo Sizemore character Monster
Jeff Tenney character Monster
Jennifer Trudrung character Monster
Ashton Lee Woolen character Monster
Coleman Youmans character Monster
E. Roger Mitchell character Mayor (uncredited)
Jason Davis character Cyclist (uncredited)
Ella Wahlestedt character Anna (uncredited)
