Joey King

Wren

Kris Sidberry

Librarian

Adrian M. Mompoint

Jock (uncredited)

Michael Tow

Calculus Teacher (uncredited)

Kevin Chapman

Mr. Jensen

Glenn S. Gainor

Executive Producer

Javier Botet

Slender Man

Michael Reilly Burke

Hallie's Dad

Adam Kolbrenner

Executive Producer

Sylvain White

Director

Jeffrey Corazzini

Police Officer (uncredited)

Tracey Nyberg

Executive Producer

Taylor Richardson

Lizzie

Jaz Sinclair

Chloe

Annalise Basso

Katie

Angela Hope Smith

Nurse

Julia Goldani Telles

Hallie

Alex Fitzalan

Tom

Jessica Blank

Hallie's Mom

Miguel Nascimento

Kyle

Eddie Frateschi

Biology Teacher

Oscar Wahlberg

Boy with Glasses

Danny Beaton

Burley Kid

Marc Carver

Doctor

Damon D'Amico Jr.

Student

Timothy Brierley

Tour Guide

Kayla Caulfield

High School Student (uncredited)

Kieran Tuomey

Student (uncredited)

David Birke

Writer

Ryan H. Cunningham

Executive Producer

Louis Sallerson

Executive Producer