- Amanda Tapping
- Â Dr. Helen Magnus 59 episodes, 2008-2011
- Robin Dunne
- Â Dr. Will Zimmerman / ... 58 episodes, 2008-2011
- Christopher Heyerdahl
- Â Bigfoot / ... 59 episodes, 2008-2011
- Ryan Robbins
- Â Henry Foss 58 episodes, 2008-2011
- Agam Darshi
- Â Kate Freelander 37 episodes, 2009-2011
- Emilie Ullerup
- Â Ashley Magnus 18 episodes, 2008-2011
- Jonathon Young
- Â Nikola Tesla 16 episodes, 2008-2011
- Robert Lawrenson
- Â Declan MacRae 14 episodes, 2009-2011
- Pascale Hutton
- Â Abby Corrigan 9 episodes, 2010-2011
- Ian Tracey
- Â Adam Worth 8 episodes, 2010-2011
- Lynda Boyd
- Â Dana Whitcomb 6 episodes, 2008-2009
- Chuck Campbell
- Â Two Faced Guy 5 episodes, 2008-2011
- Peter Wingfield
- Â Dr. James Watson 5 episodes, 2008-2011
- Jim Byrnes
- Â Gregory Magnus 4 episodes, 2008-2011
- Shekhar Paleja
- Â Dr. Ravi Ganapathiraman 5 episodes, 2010-2011
- Christine Chatelain
- Â Clara Griffin 5 episodes, 2008-2011
- Paul McGillion
- Â Terrance Wexford 4 episodes, 2010
- Brian Markinson
- Â Greg Addison 4 episodes, 2011
- Sahar Biniaz
- Â Kali 4 episodes, 2010
- Amanda May
- Â Sally the Mermaid / ... 2 episodes, 2008-2009
- Callum Blue
- Â Edward Forsythe 3 episodes, 2010
- Matty Finochio
- Â Virgil St. Pierre / ... 3 episodes, 2008-2011
- Carlo Rota
- Â Richard Feliz / ... 3 episodes, 2011
- Françoise Yip
- Â Dr. Lillian Lee 3 episodes, 2011
- Jody Thompson
- Â Fallon 3 episodes, 2011
- Terry Chen
- Â Charles 3 episodes, 2010
- Brad Proctor
- Â Two Faced Guy 3 episodes, 2008
- Balinder Johal
- Â Rheka 3 episodes, 2010
- Lauren K. Robek
- Â Mary Anne Zimmerman 3 episodes, 2008
- Pauline Egan
- Â Erika Myers 3 episodes, 2010-2011
- Kandyse McClure
- Â Meg 3 episodes, 2008-2011
- Alex Diakun
- Â Doctor 2 episodes, 2008-2009
- Panou
- Â Sylvio Rudd 1 episode, 2008
- Ron Selmour
- Â Kanaan 3 episodes, 2010-2011
- Gil Bellows
- Â Caleb 2 episodes, 2011
- Adam Greydon Reid
- Â Bruno Delacourt 2 episodes, 2011
- Chris Gauthier
- Â Walter / ... 2 episodes, 2009-2010
- Polly Walker
- Â Ranna Seneschal 2 episodes, 2010-2011
- Kavan Smith
- Â Det. Joe Kavanaugh / ... 2 episodes, 2008
- Cainan Wiebe
- Â Alexei 2 episodes, 2008
- Vincent Gale
- Â Nigel Griffin 2 episodes, 2010-2011
- Darren Shahlavi
- Â Ennis Camden / ... 2 episodes, 2008-2009
- Darien Provost
- Â Young Will 2 episodes, 2008
- Tom McBeath
- Â General Villanova 2 episodes, 2011
- Conrad Coates
- Â Yusuf 2 episodes, 2011
- Peter Bryant
- Â Cabal Team Leader 2 episodes, 2008
- Nicholas Podbrey
- Â Man 2 episodes, 2008
- Sandy Robson
- Â Remy 2 episodes, 2009-2011
- Kurt Evans
- Â Agent Gavin Crealy 2 episodes, 2011
- David Milchard
- Â Garris 2 episodes, 2011
- Nels Lennarson
- Â Commander Juno Toland 2 episodes, 2010-2011
- Simon Webb
- Â Simon / ... 2 episodes, 2008-2011
- Greyston Holt
- Â Lieutenant Coxwell 2 episodes, 2011
- Vibhor Mathur
- Â Arjuna 2 episodes, 2010
- Sheri Rabold
- Â Molly 2 episodes, 2008
- Margot Berner
- Â Imogene Worth 2 episodes, 2010-2011
- Michael Patric
- Â Alistair 2 episodes, 2010-2011
- Adam Copeland
- Â Thelo 2 episodes, 2011
- Martin Christopher
- Â False Priest / ... 2 episodes, 2010
- R. Nelson Brown
- Â Squid 1 episode, 2008
- Ian Neeson
- Â Captain 2 episodes, 2010
- Michael Adamthwaite
- Â Albert Russo / ... 2 episodes, 2008-2010
- Lee Wilson
- Â Iguana Creature / ... 2 episodes, 2008-2011
- Nimet Kanji
- Â Pili 2 episodes, 2010
- Michael Hanus
- Â Jax - Lead Goon 2 episodes, 2010
- Rob Hayter
- Â Mothman / ... 1 episode, 2008-2011
- Byron Chief-Moon
- Â Spirit Being 2 episodes, 2010
- Fraser Aitcheson
- Â Herusan 2 episodes, 2011
- Mig Macario
- Â Wahid / ... 2 episodes, 2011
- Sarah Strange
- Â Dr. Allison Grant 1 episode, 2008
- Brenda Campbell
- Â Michelle Moran 1 episode, 2011
- Katharine Isabelle
- Â Sophie 1 episode, 2008
- Rekha Sharma
- Â Amy Saunders 1 episode, 2008
- Peter Outerbridge
- Â Malcolm Dawkins 1 episode, 2008
- Gabrielle Rose
- Â Ruth Meyers 1 episode, 2008
- Byron Lawson
- Â Danny Bradley 1 episode, 2008
- Erica Cerra
- Â Emma Correia 1 episode, 2009
- Michael Shanks
- Â Jimmy 1 episode, 2009
- Nicole Muñoz
- Â Jessica Mitchell 1 episode, 2009
- Anne Marie DeLuise
- Â Rachel 1 episode, 2009
- Richard Zeman
- Â Olaf von Ausburg 1 episode, 2009
- Chasty Ballesteros
- Â Bridget 1 episode, 2010
- Ntsiki Kheswa
- Â Nozipho 1 episode, 2010
- Sandrine Holt
- Â Charlotte Benoit 1 episode, 2011
- Caroline Cave
- Â Sheila Delacourt 1 episode, 2011
- Andrew Kavadas
- Â Lestrade 1 episode, 2011
- Rick Howland
- Â Galvo 1 episode, 2011
- Miranda Frigon
- Â Danu 1 episode, 2008
- Alex Zahara
- Â Carver 1 episode, 2008
- Adrien Dorval
- Â Viktor Braun 1 episode, 2008
- Michael Eisner
- Â Edward Meyers 1 episode, 2008
- Colin Cunningham
- Â Gerald 1 episode, 2009
- Aleks Paunovic
- Â The Duke 1 episode, 2009
- Colin Lawrence
- Â Scofield 1 episode, 2009
- Hiro Kanagawa
- Â Ark-Fong Li 1 episode, 2009
- Ryan Kennedy
- Â Darrin Wilson 1 episode, 2009
- Sean Tyson
- Â Simmons 1 episode, 2009
- Shayan Bayat
- Â Tad Freelander 1 episode, 2009
- Hamza Fouad
- Â Male Zulu Empath 1 episode, 2010
- Michael J Rogers
- Â Detective Stanley O'Farrell 1 episode, 2010
- Raquel Riskin
- Â Cheryl 1 episode, 2010
- Jodi Balfour
- Â Terry 1 episode, 2011
- Al Sapienza
- Â Jacob Zimmerman 1 episode, 2011
- Aliyah O'Brien
- Â Afina 1 episode, 2011
- Tinsel Korey
- Â Sioux 1 episode, 2011
- Lara Gilchrist
- Â Cassidy Turner 1 episode, 2011
- Gerard Plunkett
- Â Fordis 1 episode, 2011
- Jenn MacLean-Angus
- Â Dr. Coates 1 episode, 2011
- Marvin Ishmael
- Â Aged Ravi 1 episode, 2011
- Justine Harding
- Â Street Urchin Girl 1 episode, 2011
- Leah Cairns
- Â Tatha 1 episode, 2008
- John Tench
- Â Warehouse Worker Garvin 1 episode, 2008
- Mackenzie Gray
- Â Mr. Jones 1 episode, 2008
- Thai-Hoa Le
- Â Tashi 1 episode, 2008
- Chad Rook
- Â Chad Spencer 1 episode, 2009
- Jason Schombing
- Â Small flying abnormal 1 episode, 2009
- Tim Perez
- Â Constantine 1 episode, 2009
- Babs Chula
- Â Cabal scientist / ... 1 episode, 2009
- Jason Bryden
- Â Ellison 1 episode, 2009
- Robert Clarke
- Â Scientist 1 episode, 2010
- Jason Poulsen
- Â Dave 1 episode, 2010
- Marcia Moulton
- Â Musa 1 episode, 2010
- Peter DeLuise
- Â Ernie Watts 1 episode, 2011
- Adrian Holmes
- Â Lab Technician 1 episode, 2011
- Jordana Largy
- Â Josie 1 episode, 2011
- John Novak
- Â Thug Boss 1 episode, 2011
- Scott North
- Â Murray 1 episode, 2011
- Laura Mennell
- Â Caird 1 episode, 2008
- David Nykl
- Â Lloyd Strickland 1 episode, 2008
- Peter Shinkoda
- Â Andy Fets 1 episode, 2008
- Matthew Walker
- Â Oliver Braithwaite 1 episode, 2008
- Daryl Shuttleworth
- Â Mr. Peralta 1 episode, 2008
- Chris Nelson Norris
- Â Glen Meyers 1 episode, 2008
- Jason Benson
- Â Uniform Cop 1 episode, 2008
- Meghan Ory
- Â Laura S. 1 episode, 2009
- John Paul McGlynn
- Â Tosen 1 episode, 2009
- Leslie Woolman
- Â Young Kate 1 episode, 2009
- Scott McNeil
- Â Birot 1 episode, 2010
- Tobias Slezak
- Â Adam 1 episode, 2010
- Martin Cummins
- Â Brad Sylvester 1 episode, 2011
- Barclay Hope
- Â Security Force Commander 1 episode, 2011
- Brent Stait
- Â Finn Noland 1 episode, 2011
- James Pizzinato
- Â Koda 1 episode, 2011
- Douglas O'Keeffe
- Â Col. Franz Korba 1 episode, 2011
- Michael Arnold
- Â Street Urchin Boy 1 1 episode, 2011
- Rukiya Bernard
- Â Kayla Bradley 1 episode, 2008
- Alison Araya
- Â Giselle 1 episode, 2008
- David Richmond-Peck
- Â Jake Polanski 1 episode, 2008
- Mark Oliver
- Â Cabal Agent 1 episode, 2008
- Sean Mathieson
- Â Young Henry 1 episode, 2008
- Dean McKenzie
- Â Construction Site Foreman 1 episode, 2009
- Adrienne Carter
- Â Female Vampire 1 episode, 2009
- Dean Redman
- Â Goon killed by Duke 1 episode, 2009
- Dan Payne
- Â The Adjuster Actor 1 1 episode, 2010
- John Emmet Tracy
- Â British Museum Curator 1 episode, 2010
- Luvia Petersen
- Â Narra 1 episode, 2010
- Gary Jones
- Â George 1 episode, 2010
- Duncan Fraser
- Â Prime Minister 1 episode, 2010
- Anjali Jay
- Â Jasmine 1 episode, 2011
- Alex Ferris
- Â Young Will 1 episode, 2011
- Edward Foy
- Â Horatio Gibbs 1 episode, 2011
- Tora Hylands
- Â Nicholls 1 episode, 2011
- Erin Lacourciere
-  Jeanette Anaïse 1 episode, 2011
- Shalaquin Epps
- Â Street Urchin Boy 2 1 episode, 2011
- James Kirk
- Â Aaron Braithwaite 1 episode, 2008
- Sam Laird
- Â Robbie Meyers 1 episode, 2008
- David Lyle
- Â Father 1 episode, 2008
- William 'Big Sleeps' Stewart
- Â Constantine Hench 1 episode, 2009
- Raf Rogers
- Â Geoff T. 1 episode, 2009
- Quelemia Sparrow
- Â Miss Kennair 1 episode, 2009
- Paul Stanley
- Â Navajo Man 1 episode, 2009
- Michael Challenger
- Â Mercenary 1 episode, 2009
- Maiko Yamamoto
- Â Medusa 1 episode, 2009
- Paula Giroday
- Â Temptress 1 episode, 2010
- Mary Black
- Â Grace 1 episode, 2010
- Sylvesta Stuart
- Â Seralops Abnormal 1 episode, 2010
- Alexander Kambolis
- Â Linor 1 episode, 2010
- Charlie Carrick
- Â Tyler 1 episode, 2011
- Venus Terzo
- Â Capt. Franklin 1 episode, 2011
- Colleen Winton
- Â Anna 1 episode, 2011
- Richard de Klerk
- Â U.S. Sergeant 1 episode, 2011
- Mark Gibbon
- Â Cabal Agent 1 episode, 2008
- Brock Johnson
- Â The Mechanic 1 episode, 2008
- Jeb Beach
- Â Chemist 1 episode, 2008
- Daniel Bruce
- Â Dead Pilot 1 episode, 2008
- Giacomo Baessato
- Â Dead Steve 1 episode, 2009
- Michael Benyaer
- Â Assam 1 episode, 2009
- Brenda McDonald
- Â Navajo Woman 1 episode, 2009
- Stanley Tsang
- Â Dr. Hiromata 1 episode, 2009
- Robin Mossley
- Â Thomas 1 episode, 2010
- Denton Winn
- Â Angelo 1 episode, 2010
- Andrew Halliwell
- Â French Man 1 episode, 2011
- Nigel Vonas
- Â Cabal Alpha Team Driver 1 episode, 2008
- Steven Man
- Â The Surgeon 1 episode, 2008
- Michael No
- Â Snow Creature 1 episode, 2008
- Doug Abrahams
- Â Security Man 1 episode, 2009
- Daren A. Herbert
- Â Cabal Tech 1 episode, 2009
- Steve Archer
- Â Thomas Rayburn 1 episode, 2009
- Addison Tessema
- Â Navajo Boy 1 episode, 2009
- Eric Keenleyside
- Â Detective Michael Bronson 1 episode, 2010
- Valin Shinyei
- Â Biza 1 episode, 2010
- Tatsuya Ishii
- Â Kyoshirou Onryuji 1 episode, 2010
- Elysia Rotaru
- Â French Woman 1 episode, 2011
- Sage Brocklebank
- Â Canadian Press Photographer 1 episode, 2011
- Emily Tennant
- Â Young Helen 1 episode, 2008
- Monica Mustelier
- Â Maria the Nurse 1 episode, 2009
- Peter Flemming
- Â FBI Special Agent Bruce Tanner 1 episode, 2010
- Chris Cochrane
- Â The Adjuster Actor 2 1 episode, 2010
- Christopher Gaze
- Â Victorian Doctor 1 1 episode, 2008
- Malik McCall
- Â Lawrence Birch 1 episode, 2008
- Melissa Poll
- Â Zoe Rayburn 1 episode, 2009
- Diana Pavlovská
- Â Jagna Lutrova 1 episode, 2008
- Charles Singh
- Â Ajay Paveljit 1 episode, 2010
- Aidan Pringle
- Â Vern Kovacs 1 episode, 2008
- Mihola Terzic
- Â Waitress 1 episode, 2008
- Suniel Samra
- Â Indian Boy 1 episode, 2010
- Dana McLoughlin
- Â Hooker / ... 1 episode, 2008
- Dan Joffre
- Â Transit Cop 1 episode, 2008
- Dan Shea
- Â Transit Cop 1 episode, 2008
- Ian A. Wallace
- Â Fire Creature 1 episode, 2008
- Ivan De Leon
- Â Med Tech 1 episode, 2008
- Ellie Harvie
- Â Eleanor 1 episode, 2008
- Tim Fellingham
- Â Brad 1 episode, 2010
- Adrian Hough
- Â Liam 1 episode, 2010
- Allison Hossack
- Â Dr. Lillian Myers 1 episode, 2010
- Jorge Vargas
- Â Denny Stefano 1 episode, 2010
- Benita Ha
- Â Sherilee Wilkins 1 episode, 2010
- Patrick Keating
- Â Joe 1 episode, 2010
- Bhavkhandan Singh Rakhra
- Â Grandfather 1 episode, 2010
- Chris Nowland
- Â Orderly 1 1 episode, 2010
- Rimple Sumer
- Â Distraught Woman 1 episode, 2010
- Fabrice Grover
- Â Father Nathaniel Jensen 1 episode, 2010
- Brent McLaren
- Â Orderly 2 1 episode, 2010
- Isaiah Adam
- Â Helmsman 1 episode, 2010
- Bal Nagra
- Â Janu 1 episode, 2010
- Juan Riedinger
- Â German Major 1 episode, 2011
- Zak Santiago
- Â Captured Abnormal 1 episode, 2011
- Sean Rogerson
- Â Castor 1 episode, 2011
- Harrison Xu
- Â Additional Voices 1 episode, 2011
- Kwesi Ameyaw
- Â Colonel Bosh 1 episode, 2011
- Dalias Blake
- Â Abnormal Leader 1 episode, 2011
- Karyn Michelle Baltzer
- Â Lacynth 1 episode, 2011
- Richard Stroh
- Â Oren 1 episode, 2011
- Aaron Brooks
- Â Lieutenant Hallman 1 episode, 2011
- J.C. Williams
- Â SCIU Security Basil 1 episode, 2011
- Nic Rhind
- Â German Lieutenant 1 episode, 2011
- Darren Bennett
- Â SCIU Security Pierre 1 episode, 2011
- Jason Bax
- Â SCIU Worker 1 episode, 2011
- Colin Corrigan
- Â Cabal Agent (uncredited) 1 episode, 2008
- Brian McCaig
- Â Magnus Staffer (uncredited) 1 episode, 2008
- Yaroslav Poverlo
- Â Jagna's Husband (uncredited) 1 episode, 2008
- Challen Cates
- Â Woman (uncredited) 1 episode, 2009
- Lani Gelera
- Â Female Super Abnormal (uncredited) 1 episode, 2009
- Christian Sloan
- Â Actor / ... (uncredited) 1 episode, 2010
- Almeera Jiwa
- Â Dancer (uncredited) 1 episode, 2010
- Kasey Ryne Mazak
- Â Japanese Pedestrian (uncredited) 1 episode, 2010
- Potjana Khong-Jaroen
- Â Cambodian Girl (uncredited) 1 episode, 2010
- Lauren Watson
- Â Bioluminescent (uncredited) 1 episode, 2011