Brie Larson
Ma
Jacob Tremblay
Jack
Joan Allen
Nancy
Sean Bridgers
Old Nick
Tom McCamus
Leo
William H. Macy
Robert
Cas Anvar
Dr. Mittal
Amanda Brugel
Officer Parker
Wendy Crewson
Talk Show Hostess
Joe Pingue
Officer Grabowski
Sandy McMaster
Veteran
Matt Gordon
Doug
Zarrin Darnell-Martin
Attending Doctor
Jee-Yun Lee
News Anchor
Randal Edwards
Lawyer
Justin Mader
FBI Agent
Ola Sturik
Reporter #1
Rodrigo Fernandez-Stoll
Reporter #2
Rory O'Shea
Reporter #3
Kate Drummond
Neighbour
Jack Fulton
Jack's Friend
Chantelle Chung
Clerk (uncredited)
Brad Wietersen
TV Crewman (uncredited)
Graeme Potts
TV Cameraman (uncredited)
Katelyn Wells
Teenage Girl (uncredited)
Celeste Bruno
Heather Noelle (uncredited)
Megan Park
Laura (uncredited)