Joely Richardson

Character: Dr. Iris Varnack

Justina Machado

Character: Alma Ansen

Ann Cusack

Character: Denise Connelly

Scott Cohen

Character: Governor Mike Newsome

David Ramsey

Character: Curtis Ansen

Peter O'Brien

Character: Alan

Carolyn Dando

Character: Lauren Connelly

Kate Butler

Character: Chief of Staff Jean Loos

Rebecca Hamilton

Character: Sarah Newsome

Kayte Ferguson

Character: Tamara Jones

Kodi Smit-McPhee

Character: Toby Connelly

Stacy Keach

Character: Collin Reed

John Atkinson

Character: Ed Connelly

Trevor Sai Louie

Character: Dr. Kwan

Latham Gaines

Character: Kostmart Manager

Jonny Pasvolsky

Character: Governor Newsome's Aide

Steve Bastoni

Character: FEMA Director McGarrett

Cameron Smith

Character: War Room Staffer

Mia Pistorius

Character: Harried Mother

Eliana Saenz

Character: Armory Nurse

Geraline Knox

Character: Sandra Ling

Judi Farr

Character: Mrs. Koppel

Shireen Shah

Character: Shop Owner

Susan Brady

Character: Female Governor

Lynette Romero

Character: National News Correspondent

Margaret Blay

Character: Alma's Elderly Neighbor

Jerome Ehlers

Character: Chad Sinclair

Mark Tronson

Character: Derek Newsome

Robin Kora

Character: Dying Woman's Husband

Brad Hills

Character: Bart Jenkins

Duncan Young

Character: Suicide Man

Nicki Paull

Character: HHS Sec's Aide

Mark Clare

Character: Transportation Secretary

Alan Lovell

Character: Male Governor

Paul Gittins

Character: Government Worker

Nigel Godfrey

Character: British Correspondent

Costa Ronin

Character: Russian Correspondent

Ferdinand Hoang

Character: Chinese Executive #1

Sandy Winton

Character: Little League Father

Shane C. Rodrigo

Character: Desperate / Reasonable Man

Joseph Woo

Character: Chinese Executive #2

Frankie Fu

Character: Chinese Executive #3

Justin Hansen

Character: Dying Man

Eoin McDonald

Character: Dying Patient

Michelle Mellgren

Character: Kostmart Employee

Linda McFetridge

Character: Harried Mother (uncredited)

Sara Wiseman

Character: Susan Wood (uncredited)

Lynnanne Zager

Character: Dr. Judy (uncredited)

Matthew Chamberlain

Character: Reporter (uncredited)

David Aston

Character: Reporter #1 (uncredited)