Kit Harington
John F. Donovan

Natalie Portman
Sam Turner

Jacob Tremblay
Rupert Turner

Susan Sarandon
Grace Donovan

Kathy Bates
Barbara Haggermaker

Ben Schnetzer
Rupert Turner (21 y.o.)

Thandiwe Newton
Journalist

Jared Keeso
James Donovan

Chris Zylka
Will Jefford Jr.

Amara Karan
Miss Kureshi

Emily Hampshire
Amy Bosworth

Michael Gambon
Man in Diner

Sarah Gadon
Liz Jones

Susan Almgren
Aunt Faith

Jane Wheeler
Aunt Anne

Craig Eldridge
Uncle Patrick

Ari Millen
Big Billy

Gijs Blom
Rupert's Boyfriend

Rob Baker
Late Night Show Host

Ellen David
Adam's Mother

Pat Kiely
Director

Anne Mroczkowski
News Anchor

Guenièvre Sandré
Barmaid

Sangita Patel
Journalist #1

Hamza Haq
Journalist #2

Matthew Raudsepp
Hellsome High Actor

Michael Brunet
Cashier

Michael Dozier
Lawyer #1

Pierre-Luc Lafontaine
Fan in the Club

Vincent Messina
Young Fan

Dakota Jamal Wellman
Eric (uncredited)

Leni Parker
Bonnie (uncredited)

Katy Breier
Trish (uncredited)

Alison Louder
Hellsome High Actress (uncredited)

Brent Skagford
Editor #1 (uncredited)

Carolyn Fe
Porter (uncredited)

Connor McMahon
Intern (Sasha) (uncredited)

Holly Bernier
Journalist (uncredited)

Sam Taylor Buck
Young Daniel (uncredited)

Daniel Murphy
Editor #2 (uncredited)