Chloë Grace Moretz character Susannah Cahalan
Thomas Mann character Stephen Grywalski
Richard Armitage character Tom Cahalan
Carrie-Anne Moss character Rhona Nack
Jenny Slate character Margo
Tyler Perry character Richard
Alex Zahara character Allen
Jenn MacLean-Angus character Giselle
Ken Tremblett character Senator
Navid Negahban character Dr. Najjar
Robert Moloney character Dr. Ryan
Agam Darshi character Dr. Khan
Janet Kidder character Dr. Siskin
Vincent Gail character Dr. Samson
Daniel Bacon character Dr. Han
Alison Araya character EEG Tech
Brian McCaig character Intern
Elizabeth Bowen character Publicist
Nicole LaPlaca character Young Nurse
Lindsay Navarro character Young Waitress
Jessie Fraser character Woman
Lee Majdoub character Guy
