Farren Blackburn Director Naomi Watts Mary Actor Oliver Platt Dr. Wilson Actor Charlie Heaton Stephen Actor Jacob Tremblay Tom Actor Clémentine Poidatz Lucy Actor Alex Braunstein Aaron Actor David Cubitt Doug Actor Crystal Balint Grace Actor Ellen David Joan Actor Tim Post Sheriff Actor Peter Outerbridge Richard Actor Anton Chevier Stephen 5 Years Old Actor Thomas Macedo Stephen 9 Years Old Actor Christina Hodson Screenwriter Ariel Zeitoun Producer Claude Léger Producer Christine Haebler Producer Tory Metzger Executive Producer David Linde Executive Producer Lisa Ellzey Executive Producer Jonathan Vanger Executive Producer Romuald Drault Executive Producer Trish Dolman Executive Producer Yves Bélanger Cinematographer Baxter Film Editing Maryline Monthieux Film Editing Nathaniel Mechaly Original Music Paul Denham Austerberry Production Design Charlotte Rouleau Art Director Jeremy Stanbridge Art Director Carol Lavallee Set Decoration Odette Gadoury Costume Design Andrea Kenyon Casting Randi Wells Casting Lucinda Syson Casting Kate Ringsell Casting