Chloë Grace Moretz Susannah Cahalan
Charlize Theron Producer
Carrie-Anne Moss Rhona Nack
Richard Armitage Tom Cahalan
Jenny Slate Margo
Thomas Mann Stephen Grywalski
Tyler Perry Richard
Navid Negahban Dr. Najjar
Alison Araya EEG Tech
Agam Darshi Dr. Khan
Janet Kidder Dr. Siskin
Ken Tremblett Senator
Lee Majdoub Guy
Elizabeth Bowen Publicist
Jessie Fraser Woman
Lauro David Chartrand-DelValle Stunt Coordinator
Alex Zahara Allen
Jason Tobias Associate Producer
Lindsay MacAdam Producer
John Paesano Original Music Composer
Robert Moloney Dr. Ryan
Daniel Bacon Dr. Han
Gerard Barrett Director, Screenplay, Co-Producer
Joseph C. Bond IV Editor
Nicole LaPlaca Young Nurse
Jenn MacLean-Angus Giselle
Beth Kono Producer
Yaron Orbach Director of Photography
Ross Dempster Production Design
A.J. Dix Producer
Todd Giroux Associate Producer
Farnaz Khaki-Sadigh Costume Design
Brian McCaig Intern
Susannah Cahalan Novel
Lindsay Navarro Young Waitress
Rob Merilees Producer
Lisa Wolofsky Executive Producer
Vincent Gail Dr. Samson