Julia Goldani Telles
Hallie
Joey King
Wren
Jaz Sinclair
Chloe
Javier Botet
Slender Man
Annalise Basso
Katie
Alex Fitzalan
Tom
Taylor Richardson
Lizzie
Jessica Blank
Hallie's Mom
Michael Reilly Burke
Hallie's Dad
Kevin Chapman
Mr. Jensen
Miguel Nascimento
Kyle
E
Eddie Frateschi
Biology Teacher
Oscar Wahlberg
Boy with Glasses
D
Danny Beaton
Burley Kid
M
Marc Carver
Doctor
Kris Sidberry
Librarian
A
Angela Hope Smith
Nurse
D
Damon D'Amico Jr.
Student
T
Timothy Brierley
Tour Guide
Kayla Caulfield
High School Student (uncredited)
Jeffrey Corazzini
Police Officer (uncredited)
Michael Tow
Calculus Teacher (uncredited)
A
Adrian M. Mompoint
Jock (uncredited)
Kieran Tuomey
Student (uncredited)
Gabrielle Lorthe
Cheerleader (uncredited)
Y
Yohanna Perez
Student (uncredited)