Brie Larson as Grace Howard

John Gallagher Jr. as Mason

Kaitlyn Dever as Jayden Cole

Rami Malek as Nate

LaKeith Stanfield as Marcus

Kevin Hernandez as Luis

Melora Walters as Dr. Hendler

Stephanie Beatriz as Jessica

Lydia Du Veaux as Kendra

Alex Calloway as Sammy

Frantz Turner as Jack

Diana Maria Riva as Nurse Beth

Harold Cannon as Mason's Dad

Silvia Curiel as Mason's Mom

Bran'dee Allen as Shawnta

Danny Roper as David

Elyssa Gutierrez as Anna

Garryson Zamora as Thom

Michael Marto as Connor

Patricia Barrett as Tracy

Tanya Marie A. Bitanga as Nikki

Zoe Wilkens as Spring

Angel Amaral as Trevor

Arnold Barrera as Mariachi Band Member, Trumpet

Joseph Bruley as Mariachi Band Member, Guitar

Fred Herrera as Mariachi Band Member, Guitarron

Shika Moran as Guest at Mason's Parents' Party

Nikki Chapman as Guest at Mason's Parents' Party

Fay DeLaCruz as Guest at Mason's Parents' Party

Cameron Gore as Guest at Mason's Parents' Party

Anthony Puentes as Guest at Mason's Parents' Party

Veronica Puentes as Guest at Mason's Parents' Party

Laura Macias as Guest at Mason's Parents' Party

Ana Shiravi as Guest at Mason's Parents' Party

Mohammad Shiravi as Guest at Mason's Parents' Party

Edward Goldstein as Guest at Mason's Parents' Party

Etta Goldstein as Guest at Mason's Parents' Party

Brett Goldstein as Guest at Mason's Parents' Party

Alexandra Estrada as Guest at Mason's Parents' Party

Michelle Nordahl as Guest at Mason's Parents' Party

Jared Callahan as Guest at Mason's Parents' Party

Joel P. West as Guest at Mason's Parents' Party

Jessica Nordahl as Guest at Mason's Parents' Party

Andrea Macias as Guest at Mason's Parents' Party

Kaily McCoy as Guest at Mason's Parents' Party

Thaddeus McRae as Guest at Mason's Parents' Party

Kenny Laubbacher as Guest at Mason's Parents' Party

Pamela Luna as Guest at Mason's Parents' Party

Valentina I. Valentini as Guest at Mason's Parents' Party

Brad Kester as Guest at Mason's Parents' Party

James Abraham as Guest at Mason's Parents' Party

Angelina Assereto as Guest at Mason's Parents' Party

Merrily Cretton as Guest at Mason's Parents' Party

Spring Cretton as Guest at Mason's Parents' Party

Patrick James as Guest at Mason's Parents' Party

Christopher Jun as Guest at Mason's Parents' Party