Odessa Young

as Lily Colson

Hari Nef

as Bex Warren

ABRA

as Em Lacey

Suki Waterhouse

as Sarah Lacey

Anika Noni Rose

as Nancey Lacey

Colman Domingo

as Principal Turrell

Maude Apatow

as Grace

Bella Thorne

as Reagan Hall

Joel McHale

as Nick Mathers

Bill Skarsgård

as Mark

Cody Christian

as Johnny

Kathryn Erbe

as Rebecca Colson

Susan Misner

as Rose Mathers

Danny Ramirez

as Diamond

Kelvin Harrison, Jr.

as Mason

Noah Galvin

as Marty

Joe Chrest

as Lawrence

Jeff Pope

as Officer Ritcher

Jennifer Morrison

as Margie Duncan

J.D. Evermore

as Chief Patterson

Lukas Gage

as Eric Lafont

Cullen Moss

as Mayor Bartlett

Stacie Davis

as Langley

Destiny Reed

as Allie

Liz Elkins Newcomer

as Mrs. Bartlett

Wolfgang Novogratz

as Dave

Isabella Esposito

as Nikki

Lucy Faust

as Alexis Turrell

Geraldine Singer

as Lisa Sanders

Caden Swain

as Donny

Andrene Ward-Hammond

as Officer Daniels

Silas Cooper

as Grace's Father

Toney Chapman Steele

as Angry Mob (uncredited)

Colby Slayter

as Red Hat Football Player (uncredited)

William Schaff

as Masked Man (uncredited)

Rey Reynaud

as Masked Neighbor / Diamond Body Double (uncredited)

Austin William Morgan

as Student (uncredited)

Bruce Vincent Logan

as Masked Gunman (uncredited)

Felicity Lartigue

as Cheerleader (uncredited)

Emily LaGroue

as Cheerleader (uncredited)

Stephanie Davis Holmes

as Citizen (uncredited)

Josephine Hennessey

as Masked Townsperson (uncredited)

Paisley Gant

as Student (uncredited)

Sarah-Grace Donnelly

as Student (uncredited)

Kirsten Bazet

as A / V Club Student (uncredited)

April Asbury

as Mob Patron (uncredited)

Issa Abou-Issa

as Masked Person (uncredited)

Rachel Whitman Groves

as Woman in House

Greg DiLeo

as Salem Resident 2

T.C. Carter

as Snap Back

Ariel Fournier

as Salem High Girl

Christopher Berry

as Salem Resident 1

Kennon Kepper

as Teammate 2

Gabriel Orion McCulloch

as Tank Top

Anthony Marble

as Marty's Father

Charley Vance

as Guy in Street

Daniel Williams-Lopez

as Stone-Faced Teen

Lance E. Nichols

as FBI Agent Richard Vernon

Leticia Jimenez

as Diamond's Mom

Lorelei Gilbert

as Carlie

Tom McCafferty

as Some Guy

Ben Matheny

as Passenger

Ann Mahoney

as Mom in Supermarket

Jacob A. Brown

as Teammaye