- Josh Helman - Xander Beck
- Kacey Rohl - Kerry Campbell
- Melissa Leo - Nurse Pam
- Toby Jones - Dr. Jenkins
- Toby Jones - David Pilcher
- Sarah Grey - Abigail
- Nicholas Carella - Reggie Hudson
- Hunter Dillon - Child Abby #2
- Julian Grey - Young Jason (Age 10)
- Malcolm Goodwin - Dr. Bauer
- Sandy Robson - Agent Rick Stallings
- Gary Sekhon - Head Tech
- Jessica Harmon - Woman #1
- Lisa MacFadden - Mother
- Danny Mac - Fireman (uncredited)
- Lindsay Hollister - Patricia Evans
- Tara Pratt - Bartender's Wife
- Bruce Blain - Man
- Cassandra Cavalli - Townsfolk / Singer (uncredited)
- BJ Harrison - Receptionist
- Alison Araya - Nurse 1
- Alison Araya - Nurse
- Jesse Haddock - Young Attendant
- Justin Kirk - Peter McCall
- Sarah Desjardins - Carrie
- Samuel Patrick Chu - Reed
- Jennifer Kitchen - Marcy
- Tracy Froese - Sara Barlow
- Kennedi Clements - Jenny
- Manny Jacinto - Lab Assistant
- Lusia Strus - Marcy (voice)
- Andrew Jenkins - Ted Laufer
- Murry Peeters - Tracy Salzman
- Andrew Suttar - Townsperson
- Scott Michael Campbell - Wayne Johnson
- Jared Ager-Foster - Boy on Bike
- Jared Ager-Foster - Student
- Toby Levins - Alan
- Robin Nielsen - Husband
- Tanya Hubbard - Wife
- Craig March - Workman #1
- Dakota Guppy - Little Girl / Daughter
- Kate Crutchlow - Elizabeth (uncredited)
- Glen Gordon - Finn (uncredited)
- Giacomo Baessato - Eric
- Giacomo Baessato - Eric (uncredited)
- Ron Wear - Abby (uncredited)
- Reed Diamond - Harold Balinger
- Grayson Gabriel - Toby Wilson
- Teryl Rothery - Henrietta
- Ian Tracey - Franklin Dobbs
- Lee Jeffery - Amy's Dad
- Allyson Grant - Amy's Mom
- Jeanie Cloutier - Concerned Citizen
- Fraser Corbett - Abbey (uncredited)
- Chad Krowchuk - Tim Bell
- Barclay Hope - Brad Fisher
- Sarah Jeffery - Amy
- Michael McShane - Big Bill
- Roger Haskett - Doctor Carol
- Primo Allon - Head Guard
- Jeremy Thorsen - Paul
- Jane Craven - Christina
- Jeffrey Ballard - 1st Generation Student
- Terrence Howard - Sheriff Pope
- Sarah Corrigan - Female Teen Doctor
- Iain Belcher - Rebel #2
- Hyuma Frankowski - Beach Bartender
- Kristina Hampton - Townsperson (uncredited)
- Jennifer Juniper Angeli - Dale's Wife
- Jennifer Juniper Angeli - Dale's wife
- Dylan Sloane - Harvester
- Serge Jaswal - Harvester #2
- Alexa Barajas - Pregnant Student
- Joshua Morettin - Male Teen Student
- Blair Penner - Rebel
- Juliette Lewis - Beverly Brown
- Dean Petriw - Young Jason (5)
- Mathew Yanagiya - Graduate Student (uncredited)
- Mathew Yanagiya - Wounded Soldier #1
- Janet Glassford - True Believer
- Janet Glassford - Gina
- Grayson Maxwell Gurnsey - Soldier #2
- Pete Hogan - Doctor (uncredited)
- Kavandeep Hayre - Field Medic
- Kavandeep Hayre - Med Resident
- James Michalopolous - Male Abby #4
- James Michalopolous - Abbey (uncredited)
- Kyla Matthews - Nurse Pam Kid
- Kyla Matthews - Julie
- Cody Davis - Abby Kid
- Nathan Witte - Assistant
- Donny Lucas - True Believer #2
- Donny Lucas - Victor
- Elizabeth Bowen - Proctor
- Julian LeBlanc - Lab Tech
- Kory Grim - Abby (uncredited)
- Kory Grim - Male Abby #1
- Christian Tessier - Bartender
- Gerardo Barcala - AG Team (uncredited)
- Gerardo Barcala - Townsfolk (uncredited)
- Gerardo Barcala - Mr. X, Townfolk (uncredited)
- Dustin Lloyd - Wounded Civilian
- Ricky He - Puking Resident
- Voytek Skrzeta - Father Abby
- Ian Rozylo - Shrieking Abby
- Dakota Daulby - Griffin
- Chris Shields - Charles Keen
- Jaime M. Callica - Simeon
- Jaime M. Callica - Husband
- Karen Khunkhun - News Anchor
- Tim Griffin - Adam Hassler
- Liam Hughes - Ice Cream Kid
- Katie Hayashida - Savannah
- Robert Parent - Tom
- Spencer Graham - Soldier #1
- Brian Doe - Radio Man
- Eric Mazimpaka - Male Abby #2
- Darryl Scheelar - Male Abby #3
- Kevin Haaland - Male Abby #6
- Nickolas Baric - Male Abby #7
- Greg Zach - Male Abby #8
- Ashlea Earl - Female Abby #2
- Tyronne L'Hirondelle - Whistling Man
- Tyronne L'Hirondelle - Dale
- Rochelle Okoye - Margaret
- Rochelle Okoye - Female Abby
- Kate Bateman - Nancy
- David Raynolds - Drake
- Marissa Miller - Riley
- Darren Mann - Kyle
- Tina Georgieva - Meadow
- Christian Michael Cooper - Dale's Younger Son
- Françoise Yip - Sharon
- Carolyn Anderson - Female Abby #1
- Carolyn Anderson - Female Abby #1 (uncredited)
- Carolyn Anderson - Mother Abby
- Derek Green - Nathaniel Simms
- Corina Akeson - Emily Simms
- Lisa Bunting - Headmistress
- Jason McKinnon - Hospital Official
- Shahrokh Ferdowsi - Patient (uncredited)
- Derek Schnobb - FG Townsfolk (uncredited)
- Christopher Meyer - Mario
- Amitai Marmorstein - Oscar
- Naika Toussaint - Wife
- Naika Toussaint - Jackie
- Michael Garza - Frank Armstrong
- Emma Tremblay - Lucy
- Tyson Bellusci - Ramsey
- Simone Missick - CJ's Wife
- Islie Hirvonen - Orphan Girl
- Anthony Shudra - Dale's Older Son
- Sarah Boey - Dale's Daughter
- Tom MacNeill - Clean Up Crewman (uncredited)
- Tom MacNeill - Teacher (uncredited)
- Romuald Hivert - Soldier #1
- Warren Abbott - Husband
- Matthew Smalley - Soldier #2
- Sydney Bell - Wife
- Paul Lazenby - Temple
- Latonya Williams - ER Nurse #1
- Simon Leung - Yelling Man
- RJ Fetherstonhaugh - Sean
- Hope Davis - Megan Fisher
- Tony Chris Kazoleas - Townsfolk (uncredited)
- Blake Crouch
- Chad Hodge
- Ashwin Rajan
- M. Night Shyamalan
- Donald De Line
- Nazrin Choudhury
Matt Dillon interpreta a Ethan Burke en la serie.
Juliette Lewis hace el papel de Beverly Brown.
Jason Patric interpreta a Dr. Theo Yedlin en la serie.
Nimrat Kaur interpreta a Rebecca Yedlin en la serie.
Tom Stevens interpreta a Jason Higgins en la serie.
Djimon Hounsou interpreta a CJ Mitchum en la serie.
Josh Helman interpreta a Xander Beck en la serie.
Kacey Rohl interpreta a Kerry Campbell en la serie.
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