Dylan O'Brien

Fred Fitzell

Hannah Gross

Karen

Emory Cohen

Sebastian

Keir Gilchrist

Andre

Maika Monroe

Cindy Williams

Liisa Repo-Martell

Mrs. Fitzell

Amanda Brugel

Evelyn

A.C. Peterson

Mr. MacDonald

Aaron Poole

Pierced Man

Maika Harper

Tattooed Woman

Ian Matthews

Vincent

Donald Burda

Dr. Phillips

Myles Isen

Fred at 6

Connor Smith

Scarred Man

Leslie Adlam

Female Cop

Andrew Latter

12 Year Old Boy

Jill Frappier

Mrs. Shouldice

Josh Cruddas

Twenty Something Man

Conrad Bergschneider

Male Teacher

Tracy Baker

Dancer

Jackie English

Violet

Constantine Meglis

Huge Bouncer

Elizabeth Osler

Overdosed Teen

Prince Amponsah

Mysterious Party Goer

Parker Antal

Baby Fred

Emmet Antal

Baby Fred

Landon Norris

Scarred Man (voice)

Hershel Blatt

Mike (uncredited)