| Jamie Dornan | Dr. Allan Pascal |
| Sarah Gadon | Natalie |
| Aaron Paul | Peter |
| Aiden Longworth | Louis Drax |
| Oliver Platt | Dr. Perez |
| Molly Parker | Dalton |
| Barbara Hershey | Violet Drax |
| Beckham Skodje | Louis Age 2 |
| Adam Abrams | Doctor (X-Ray) |
| Terry Chen | Elliottt |
| Randi Lynne | ER Nurse |
| John Hainsworth | ER Patient |
| Julian Wadham | Dr. Janek |
| Goldie Hoffman | ER Nurse |
| Nels Lennarson | Morgue Technician |
| Anjali Jay | Macy |
| Ostara Gardy | Ellie |
| Jennifer Derwojed | Seaworld Trainer |
| Lina Roessler | Caitlin |
| Luke Camilleri | Alex |
| Jane McGregor | Sophie |
| Sarah-Jane Redmond | Helen |
| Anthony Shudra | Milo |
| Alex Zahara | Navarra |
| Fiona Vroom | Receptionist |
| Iris Paluly | Pysch Patient #1 |
| David Lloydy | Pysch Patient #2 |
Technical Credits
| Alexandre Aja | Director,Producer |
| Maxime Alexandre | Cinematographer |
| Baxter | Editor |
| Colleen Bolton | Casting |
| Jim Brebner | Asst. Director |
| Tim Bricknell | Producer |
| Zanne Devine | Executive Producer |
| Carla Hetland | Costumes/Costume Designer |
| Rosanne Korenberg | Executive Producer |
| Max Minghella | Producer,Screenwriter |
| Rachel O'Toole | Production Designer |
| Justine Raczkiewicz | Associate Producer |
| Patrick Watson | Score Composer |
| Maureen Webb | Casting |
| Shawn Williamson | Producer |
