Joey King Wren
Annalise Basso Katie
Kevin Chapman Mr. Jensen
Michael Reilly Burke Hallie's Dad
Jaz Sinclair Chloe
Javier Botet Slender Man
Oscar Wahlberg Boy with Glasses
Sylvain White Director
James Vanderbilt Producer
Julia Goldani Telles Hallie
Taylor Richardson Lizzie
Adam Kolbrenner Executive Producer
Ramin Djawadi Original Music Composer
Michael Tow Calculus Teacher (uncredited)
David Birke Writer
Alex Fitzalan Tom
Nancy Nayor Casting
Zachary K. Lazar Genetator Operator
Bradley J. Fischer Producer
Kris Sidberry Librarian
Glenn S. Gainor Executive Producer
Erin Cole Assistant Production Coordinator
John Haley Visual Effects Supervisor
Nolan Ball First Assistant "B" Camera
Amy Kane Foley Artist
Megan Blake Graphic Designer
Brandon Campbell Music
William Sherak Producer
Steven Ticknor Sound Re-Recording Mixer
Roy Farfel Stunt Coordinator
Jill Sacco Production Coordinator
Kayla Caulfield High School Student (uncredited)
Trevor Metz Sound Effects Editor
Deborah Newhall Costume Design
Tracey Nyberg Executive Producer
Tom Davies First Assistant Director
John Vincent Mason Utility Stunts
Marc Carver Doctor
Jessica Blank Hallie's Mom
Jeff Gross Foley Mixer
Nate Underkuffler Music Editor
Andrea Ajemian Co-Producer
Angela Hope Smith Nurse
James R. Mitchell Best Boy Electric
Aidan Payne Script Supervisor
Gabrielle Lorthe Cheerleader (uncredited)
William M. Weberg Key Grip
Mathieu Baptista Special Effects Makeup Artist
Louis Sallerson Executive Producer
Steve Urban Sound Editor
Juliet Loveland Makeup Department Head
Kevin S. Parker Sound Mixer
Greg Harvey Stunt Coordinator
Debbie Holbrook Costume Supervisor
Lance Ranzer Visual Effects Supervisor
Ryan Juggler Sound Editor
Grant Conway Music Editor
Warren A. Weberg Best Boy Grip
Robyn Meisinger Producer
Shane Shisheboran Special Effects Makeup Artist
Jake York Editor
Javier Bennassar Sound Designer
Adrian M. Mompoint Jock (uncredited)
Jennifer Lynn Tremblay Assistant Costume Designer
Steve Sikora Lighting Technician
Jonathan Gesinski Storyboard Artist
Luca Del Puppo Director of Photography
Julie LeShane Special Effects Makeup Artist
Ilyana Eberhardt Stunt Double
Keith Thompson Concept Artist
Rosa J. Colón Key Costumer
Robert Schleinig Leadman