- Arnold Pinnock - Walt Forbes
- Olivia Cheng - Dr. Grace Lee
- David James Lewis - Major Gleason
- Kyra Zagorsky - Dr. Delaney
- Karin Konoval - Mrs. Bloom
- Kevin McNulty - Earl
- Eileen Pedde - Mom
- Chilton Crane - Cathy Whiteman
- Adrian Hough - Allan
- Alyson Bath - Mindy
- Laura Mennell - ADA Peckham
- Jason Gray-Stanford - Aaron Donner
- Gerard Plunkett - Ted Bishop
- Tom McBeath - Ellis
- Matthew Kevin Anderson - D13 / Derek
- Yasmeene Ball - Charlotte
- Danielle Kremeniuk - Secretary
- Lisa MacFadden - Doctor #3
- Link Baker - Agent Morton
- Carolyn Anderson - Agent Paulson
- Robert Moloney - Oliver
- Elysia Rotaru - Irene
- Jazmine Campanale - Dr. Chen
- Howie Lai - Traveler 2150
- Michael Karl Richards - Dale
- Bradley Duffy - Dale
- Barry W. Levy - Dr. Calloway
- Jennifer Copping - Sylvie Ward
- Sandy Robson - Jacob Ward
- Lee Majdoub - Dr. Barker
- Sunita Prasad - Blair
- Paloma Kwiatkowski - Abigail Paris
- Dakota Guppy - Chloe
- Todd Thomson - Dr. Higgins
- Brandyn Eddy - Doctor #2
- Brandyn Eddy - Mark
- Brandy Le - Helix
- Stephanie Bennett - Jenny
- Cameron McDonald - Graham
- Gwenda Lorenzetti - Colleen
- Fiona Hogan - Nurse Jane
- Trevor Roberts - Dad
- Xantha Radley - Vera
- James Rha - Xiao
- Michael Cha - Young Shanghai Man
- Pricilla Mudaliar - Annie Kapoor
- Jeremy Lacombe - Runner 1
- Nina Winkler - Runner 2
- Heath Affolter - Heath
- Bob Frazer - Traveler 3224
- Pat Smith - Mr. Morrissy
- Sonia Sunger - Reporter
- James R. Baylis - Bob
- Tristan Jensen - Guard
- Alison Araya - Captain Garcia
- Anesha Bailey - Ensign Jackson
- Brenden Sunderland - Young Boy
- Melissa Roxburgh - Carrie
- Benjamin Charles Watson - Lars
- Andrew Dunbar - Wayne
- Noah Beggs - Trucker
- Vincent Gale - Traveler 0029
- Kurt Evans - Programmer 0017
- Ronald Patrick Thompson - First Guardsman / Traveler 5401
- Debs Howard - Stacey
- Zoey Siewert - Young Girl
- Winslow Holmes - Terminal Patient #1
- Robin T. Rose - Terminal Patient #3
- John Tierney - Terminal Patient #4
- Lillian Lim - Terminal Patient #5
- Mel Tuck - Terminal Patient #6
- Glenn Beck - Terminal Patient #7
- Rukiya Bernard - Dr. Carroll
- Babak Haleky - Volunteer
- Darcey Johnson - Terry
- Jesse Carroll - Tall Driver
- Jerry Trimble - Coach Perry
- Yee Jee Tso - Jervis
- Lissa Neptuno - Joanne
- Colby Wilson - Mike
- Greg Harper - News Anchor
- Jannen Karr - Receptionist
- Elle McKinnon - Anna Hamilton
- Omari Newton - Orderly
- Yobdee - Bree
- Benjamin Rogers - Drake
- Karly Warkentin - Anna's Mom
- David Quinlan - Anna's Dad
- Penelope Good - Girl 1
- Parveen Dosanjh - Crystal
- Ian Tracey - Ray Green
- Stephen Lobo - Wakefield
- Chad Krowchuk - Simon
- Jason McKinnon - Officer
- Jason McKinnon - Police Officer
- Donna Yamamoto - Deputy Oslin
- Josh Blacker - Agent Callahan
- David Attar - Agent Tanner
- Laura Drummond - Agent Quinn
- Don McLeod - FBI SWAT Leader
- Barbara Wallace - Laverna
- Timothy Paul Coderre - Traveler 2383
- Callum Seagram Airlie - Taylor
- Callum Seagram Airlie - Taylor Age 12
- Nicole Anthony - Dr. Sheppard
- Henry Mah - Doctor
- Gracyn Shinyei - Naomi Davies
- Amanda Tapping - Dr. Perrow
- Fanta Sesay - Michelle
- Haig Sutherland - Doctor Mori
- Lyle Reginald - Jordan
- Sean Depner - Mikey
- Christine Lee - Nurse
- Marilyn Norry - Linda MacVicar
- Steve Makaj - Sergeant
- Steve Makaj - Sarge
- Steve Makaj - Police Sergeant
- Forbes Angus - Mr. MacVicar
- David Allan Pearson - Ned
- Genevieve Fleming - Ms. Bayle
- Malcolm Craig - Ronnie
- David Raynolds - Aleksander
- David Raynolds - Aleksander / Patrick
- Nevin Burkholder - Bartender
- Devon Alexander - Jimmi
- Bronwen Smith - Marion
- Gaalen Engen - Greg
- Beatrice Kitsos - 11 Year Old Girl
- Cody Davis - 10 Year Old Boy
- Shanel Pratap - News Anchor #2
- Garfield Wilson - Carter
- Kis Yurij - Russian #1
- Jason William Day - Russian #2
- Angela Moore - Carol
- Jesse Reid - Military Scientist
- Chris Webb - Businessman
- Karen Khunkhun - Reporter
- Audrey Smallman - 10 Year Old Girl
- Michael Meneer - News Anchor #1
- Garry Chalk - Detective Gower
- Teryl Rothery - Patricia Holden
- Angela Palmer - Tory
- Andre Tricoteux - Captor
- Mike Li - Faction Member
- Mike Li - Second Guardsman / Traveler 5402
- Lyova Beckwitt - Jackson
- Adrien Dorval - Yard Worker
- Aaron Hutchinson - Security Guard
- Milo Shandel - Pastor
- Emy Aneke - Sergeant
- Brenda Matthews - Becky
- Curtis Lum - Morrison
- Nathan Witte - Traveler Security Guard
- Sian Sladen - Nurse
- Alyssa Lynch - Rene Bellamy
- Simon Longmore - Agent Riley
- Ken Dresen - Colin
- Alex Barima - Nick
- Erika Walter - MacLaren's Future Wife
- Darren E. Scott - Masked Guy #1
- Kirk Caouette - Masked Guy #2
- Leif Havdale - Masked Guy #3
- Kirby Morrow - Hickman
- Howard Siegel - Bookie
- Michael Denis - Jeff's Lawyer
- Françoise Yip - Judge
- Magda Apanowicz - Dawn
- Magda Apanowicz - Kimberley Sustad
- Cindy Piper - Store Owner
- Lanie McAuley - Candy
- Keisha Haines - Web Cam Girl #2
- Jennifer Cheon - Web Cam Girl #3
- Lisa Marie DiGiacinto - Flight Attendant #1
- David Cubitt - Stevenson
- David Cubitt - FBI Director
- Carmel Amit - Flight Attendant #2
- Darcy Laurie - Hank
- Kathleen Duborg - Mrs. Hayes
- Mark Brandon - Hayes
- Carter Evancic - 9 Year Old Boy
- Jenny Mitchell - Stacey Nichols
- Paul Lazenby - Big Guard
- Melanie Papalia - Beth
- Kwesi Ameyaw - Doctor
- Georgia Hacche - Nurse
- Liam Hughes - Sickly Child
- Preston Vanderslice - Man Texting
- Ben Immanuel - Dr. Teslia
- Ben Immanuel - Ivon Teslia
- Lee Shan Gibson - Construction Worker
- Kylee Dawson - Shy Girl
- Balinder Johal - Indian Woman
- Paul Chih-Ping Cheng - Tall Man
- Grace Chin - News Anchor
- Glenn Ennis - Tall Man #3
- Mathew Yanagiya - EMT Traveler
- Mathew Yanagiya - Tristen
- Dan Payne - Tall Man #4
- Norm Sherry - Tall Man #6
- Enrico Colantoni - Vincent Ingram
- Ben Cotton - Christopher Rockwell
- Zak Santiago - Daniel Sosa
- William MacDonald - Gary Holden
- Aaron Craven - Ken
- Christopher Ang - SWAT Leader
- Nicole Hombrebueno - Katie Sosa
- Adam Lolacher - Officer Ross
- Naiah Cummins - 3rd AD
- Sarah Johns - Miss Davies
- Seth Whittaker - Team Leader
- Esabella Anna Karena Strickland - Maria
- Louis Ferreira - Rick Hall
- Dylan Playfair - Kyle
- Kerry Sandomirsky - Therapist
- Veenu Sandhu - Singh
- Jeb Beach - Mitch
- Eric Pollins - Priest
- Doug Chapman - Luca
- Tasya Teles - Traveler 009
- Lauren K. Robek - Mrs. Gillen
- Giles Panton - Dan Gillen
- Dan Quinn - Johnson
- Tim Carlson - Masked Figure
- Tim Carlson - Ben
- Joshua Pak - Historian
- Nevis Unipan - Child Messenger
- Jim Byrnes - James Edward Bailey
- Gary Jones - Landlord
- Linda Pollard - Sandra Wilson
- Robert Corness - Old Man
- Christopher Heyerdahl - Andrew Graham
- Veronika Hadravá - Katrina
- Veronika Hadravá - Karina
- Lisa Chandler - Emily
- Enid-Raye Adams - Amanda Myers
- Brad Mann - Tall Man #1
- Todd Mann - Tall Man #2
- Dion Riley - Reporter #1
- Jilena Cori - Reporter #2
- Leo Chiang - Swat Leader
- Fraser Corbett - Faction Member
- Natalie Moon - News Anchor 1
- Karen Holness - Samantha Burns
- Karen Holness - Samantha
- Zain Meghji - News Anchor 2
- Tarun Keram - Traveler Guard
- Mike Carpenter - Tall man
- Paul Wu - Traveler 1
- Brian Ho - Traveler 2
- Steve Ellis - Uber Driver (uncredited)
- J. Alex Brinson - Jeff Conniker
- Kimberley Sustad - Joanne Yates
- Kristine Cofsky - Officer Boyd
- Giacomo Baessato - Private Wilson
- Latonya Williams - Jessica Moore
- Hugo Raymundo - Brant Moore
- Warren Abbott - Traveler 5226
- Rebecca Shoichet - Ilsa (voice)
- Hannah Drew - Traveler 6359
- David Bloom - Priest
- Valencia Budijanto - Young Girl
- Michael Antonakos - Director (voice)
- J. Douglas Stewart - Man
- Kenneth Liu - General Chin
- Leah Cairns - Kathryn MacLaren
- Larry Hoe - FBI Agent
- Glynis Davies - Jacqueline Peele
- Benjamin Wilkinson - Corrigan
- John G. Lenic
- Eric McCormack
- Jim O'Grady
- Sally Dixon
- Brad Wright
- Carrie Hall-Mudd
- Adam Lastiwka
Eric McCormack hace el papel de Grant MacLaren.
David James Lewis hace el papel de Major Gleason.
MacKenzie Porter interpreta a Marcy Warton en la serie.
Nesta Cooper interpreta a Carly Shannon en la serie.
Jared Abrahamson interpreta a Trevor Holden en la serie.
Reilly Dolman interpreta a Philip Pearson en la serie.
Patrick Gilmore interpreta a David Mailer en la serie.
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