- Denis Forest - Malzor
- Denis Forest - Martin Cole
- Ken Pogue - John
- Jaimz Woolvett - Larry
- Amos Crawley - Young Harrison
- Gema Zamprogna - Sam Fisher
- Larry Joshua - Hardy Galt
- Lisa Jakub - Julie
- Eugene Robert Glazer - Marcus Crane
- Vlasta Vrana - Jonathan Laporte
- Aki Aleong - Tao
- Cynthia Dale - Tila
- Roy Thinnes - Van Order
- Denis Akiyama - Chin
- Noam Zylberman - Nate
- Jayne Eastwood - Grace
- Alex Carter - Clark
- Gerard Parkes - Dr. Emil Gestaine
- Keram Malicki-Sánchez - Ceeto
- Pat Mastroianni - Pitcher
- Mia Kirshner - Jo
- Aaron Ross Fraser - Plato
- Mairon Bennett - Young Hooker
- Richard Zeppieri - Tough Kid
- James Kirchner - Alien Guard
- Michael Woods - Guard
- Greg Kramer - Addict
- Peter Blais - Ralph
- Denise Fergusson - Lady at Mission
- Kurt Reis - Reverend Thomas Solter
- Nathaniel Moreau - Steven
- Donnie Bowes - Jones
- Vince Guerriero - Barrows
- Shannon Lawson - Rosa
- Dylan Neal - Scavenger
- Helen Hughes - Kate Barrows
- Sandra Caldwell - Nurse
- Laura Press - Seft
- Victoria Snow - Blade
- Illya Woloshyn - Tom
- Cal Wilson - Cappy
- Louis Tucci - Packrat
- Larry A. McLean - Mercenary
- Leonard Chow - Farmer
- Ted Ludzik - Morthren Worker
- Kathryn Rose - Rene Laporte
- Richard Sali - Aide
- Andrew Scorer - Lunatic
- Dean Richards Wiancko - Drug Dealer
- Réal Andrews - Man in Bar
- Gigi De Leon - Young Woman
- Charles McCaughan - Kemo
- Charles Kerr - Ace
- George R. Robertson - General Mann
- Paula Barrett - Miranda
- Seirge LeBlanc - Tommy
- Gerry Quigley - Cab Driver
- Alan Argue - Reporter
- Lorne Pardy - Reporter
- Ron Lea - Paul Daniels
- Dominic Cuzzocrea - Bill
- Marc Marut - Patrick
- Tanja Jacobs - Miss Gholston
- Nadine MacKinnon - Mrs. Daniels
- Joel Carlson - Adam
- Joon Kim - Bing
- Richard Comar - Advocate
- Richard Comar - Chambers / Advocate
- Ted Follows - General Arquette
- Ted Follows - General Arquettte
- Matt Birman - Thief
- Barbara Gordon - Bebe Gardner
- Maurice E. Evans - W.R. Samuels
- John Dee - Old Man
- John Dee - Mailman
- Martin Doyle - Rob Nunn
- Nadia Capone - Maureen
- Ken Quinn - Salo
- Sam Moses - Sal
- Sandy Webster - Gunther
- Marlow Vella - Ralph
- Nicolas Van Burek - Joe
- Keith Knight - Bob
- Denise McLeod - Sara
- Tre Smith - David
- Elena Kudaba - Gambler
- Belinda Metz - Scoggs
- Michael Welden - Max
- Chuck Shamata - Bradley
- Michael Rhoades - Zak
- Jorge Montesi - Gomes
- Colm Feore - Leonid Argochev
- Colm Feore - Nikita
- Markus Parilo - Desk Clerk
- Barclay Hope - MP
- Timothy Webber - Thresher
- Michael Hogan - Nash
- Vincent Dale - Hook
- Leslie Toth - Guard
- Cedric Smith - Adrian Bouchard
- R.D. Reid - Druggist
- R.D. Reid - Mark Newport
- Michael Caruana - Ralph
- Michael Caruana - Kurt
- Sandi Stahlbrand - Newscaster
- John Gilbert - Tallick
- Patricia Phillips - Bayda
- Meg Hogarth - Shirley
- Cliff Woolner - Alien Trucker
- Eric Keenleyside - Foreman
- Sam Malkin - Pollito
- Sam Malkin - Mr. Jimmy
- Mark Humphrey - Milkman
- Elias Zarou - Abraham
- Elias Zarou - Kirk
- Judah Katz - Pilot
- Dale Wilson - Roy
- Dale Wilson - Sgt. Tex
- Gwynyth Walsh - Charlotte
- Leslie Carlson - Detective
- Steve Makaj - Milkman
- James Purcell - Brock
- James Purcell - McGinnis
- Eugene A. Clark - Sgt. Gordon Reynolds
- Jack Mather - Doc
- Angelo Rizacos - Father Tim
- Angelo Rizacos - Young Alien Aide
- Paul Cœur - Roller
- Paul Cœur - Alien
- Desmond Ellis - Orel
- Jim Bearden - Rancher
- Diana Reis - Grace
- Diana Reis - Molly Stone
- Chris Potter - Farmer
- Martha Irving - Peggy
- Martha Irving - Sylvia Van Buren
- Gene Mack - Bull
- Gene Mack - Wiley
- Louise Cranfield - Young Wife
- Diane Douglass - Nurse
- Harry Booker - Sheriff Deak
- Paul De La Rosa - Cop
- Kris Ryan - Detective
- Donald Tripe - Dr. Gutterman
- Brent Carver - Jesse
- Gerry Mendicino - T.J.
- Mishu Vellani - Woman Student
- Deborah Theaker - Saleslady
- Maria del Mar - Estelle
- John Vernon - General Wilson
- Suzanne Coy - Sunethra Menathong
- Suzanne Coy - Staff Member
- Alannah Myles - Samantha
- Bernard Behrens - Psychiatrist
- Bernard Behrens - Jennings
- Paul Bettis - Sol / Dennis Lawson
- Paul Bettis - Attendant
- Albert Schultz - Ken
- Carolyn Scott - Other Woman
- Eric Schweig - Darrow
- Clark Johnson - Young
- Larry Mannell - Doctor
- Elaine Giftos - Q'Tara
- Jonathan Welsh - Jack Sawyer
- Kevin Rushton - Dog
- Kevin Rushton - Ex-Biker
- Paul Eves - Alien MP
- Paul Eves - Marine
- Sarah Campbell - Young Girl
- Larry Reynolds - Tom Kensington
- Julian Richings - Ardix
- Julian Richings - Alien Scientist
- Julian Richings - Man with Hat
- Daryl Shuttleworth - Signal Corps Technician
- Deborah Wakeham - Katya
- Martin Neufeld - Advocate
- Martin Neufeld - Finney
- Patrick Macnee - Valery Kedrov
- David Ferry - Marc Traynor
- David Ferry - Policeman
- David Calderisi - Advocate
- Gairey Richardson - Detective Bob
- Joseph Ziegler - Pat
- Tim MacMenamin - Guard
- Linda Goranson - Connie
- Ric Sarabia - Advocate
- Ric Sarabia - Teal
- Ivan Naranjo - Joseph
- John Tench - Gambler
- John Tench - Worker
- George Bloomfield - Lawyer
- Carole Galloway - Pat Thistle
- Christopher Trace - Cop
- Randall Carpenter - Margo
- John Colicos - Quinn
- Graham Batchelor - Arnold Thistle
- Robert Morelli - Sgt. Fitzpatrick
- Jim Yip - Hwang
- Steve Pernie - Derriman
- Frank Pellegrino - Mossoud
- Frank Pellegrino - Advocate
- Kim Cayer - Hooker
- Alex Karzis - Samuel
- Alex Karzis - Gerry
- James Mainprize - Bernie
- Efrain Figueroa - Gabriel Morales
- Jill Hennessy - Patty
- Jill Hennessy - Scott
- Geoffrey Bowes - Colin
- Julie Khaner - Alien Woman
- Peter Boretski - Howard Hugo
- Ken Girotti - Lang
- Michael Copeman - Advocate
- Michael Copeman - Dayton
- Lori Hallier - Mindy Cooper
- Lori Hallier - Teri
- Tim Koetting - Dr. Melish
- Mark Parr - Alien Mutant
- Daniel Kash - Guard
- John Pyper-Ferguson - Alien Mutant
- James Hong - Soo Tak
- Abbott Anderson - Morris Burnobi
- Vito Rezza - Stavrakos
- Vito Rezza - Stravrakos
- Don Allison - Milton
- Jacqueline McLeod - Blanche
- Ron Payne - Businessman
- Michael Dyson - Farmer / Alien
- Randy Atmadja - Old Clerk
- Michael Parks - Cash McCullough
- Charles W. Gray - Businessman
- Isabelle Mejias - Sherry
- John Grima - Coroner
- Peter MacNeill - Director
- Phillip Jarrett - Cop
- Dixie Seatle - Teri Novak
- Michael Rudder - Advocate
- Michael Rudder - Einhorn / Advocate
- Reg Dreger - Sergeant
- Charlene Richards - Megan
- Jill Jacobson - Envoy
- Benson Simmonds - Busboy
- Shelley Owens - Streetwalker
- Hugh Thompson - Ray
- James Rankin - Lab Tech
- Ilse von Glatz - Advocate
- Ilse von Glatz - Urick / Advocate
- Nicolas Coster - Dr. Frederick Alexander
- Thomas Hauff - Colonel Manning
- Janet Bailey - Perry
- David McKnight - Max
- Barry Kennedy - Jerry Raymond
- Cynthia Belliveau - Karen McKinney
- Carolyn Dunn - Sarah Cole
- Carolyn Dunn - Debra
- Jeremy Ratchford - Student
- Michael Eric Kramer - Commander
- Michael Eric Kramer - Advocate
- Michael Eric Kramer - Alien in contamination suit
- Warren Davis - Franklin
- Michele Scarabelli - Elise Conway
- Billie Mae Richards - Matron
- Guylaine St-Onge - Beth
- Greg Morris - General Masters
- Eric Bruskotter - Jefferson
- Rachel Blanchard - Debi McCullough
- Brenda Kamino - Nun
- Brenda Kamino - Nurse
- Stuart Stone - Bobby
- Kelly Rowan - Kim
- Alex Cord - Marcus Madison Mason
- John Novak - Alien
- Jeff Corey - Francis Flannery
- Billy Thorpe - Billy Carlos
- Lynne Griffin - Amanda Burke
- Jackie Richardson - Blanche
- Tedd Dillon - Driver
- Colleen Embree - Jordan
- Len Doncheff - Police Captain
- A.C. Peterson - Alien Hunter
- Steve Mousseau - Sheriff
- Ray James - FBI Leader
- Michael Fletcher - Beckwith
- Roger McKeen - Driver
- Helen Carscallen - Granny
- Von Flores - Alex
- Judy Sinclair - Judy
- Walker Boone - Prison Guard
- Chick Roberts - Frank
- John Blackwood - Dad
- Hume Baugh - Alien
- John Ireland - Harv
- Kirk Dunn - Hancock
- Kevin Frank - Gabriel
- Mark Holmes - Red
- Linda Singer - Biker Chick
- Jack Jessop - Bill
- James Kee - Robert Parkins
- Anne Farquhar - Newswoman
- Rita Tuckett - Miss Daly
- James Kidnie - Captain Murphy
- Todd Schroeder - Guard
- Miriam Newhouse - Ellen
- Michael Fawkes - Officer
- George Merner - Officer Helfreich
- Richard Fitzpatrick - Officer
- Terry Doyle - Dean Holden
- T.J. Scott - Lab Technician
- Jack Ammon - Sam
- Mary Beth Rubens - Marla
- Jason Blicker - Pete
- Claude Rae - Dean
- Mung-Ling Tsui - Waitress
- J.R. Zimmerman - Dr. Adams
- Neil Dainard - Detective Harley
- Kim Coates - Scott
- Barry Flatman - Hewlit
- Krista Bridges - Teen Queen
- Paul Boretski - Leo
- Philip Williams - Fred
- Conrad Coates - Driver
- Sharolyn Sparrow - Helen
- Ross Manson - Officer Roberts
- Harold Luft - Guard
- David Gardner - Larson
- George Kash - Longshoreman
- Micki Moore - Joyce Mason
- Jackie May - Nun
- Jan Rubeš - Dr. Von Deer
- Heidi von Palleske - Alien Soldier
- Wally Bolland - Policeman
- Ann Robinson - Sylvia van Buren
- Djanet Sears - Nurse
- Len Carlson - Attending Alien
- Roy Lewis - Cameraman
- James O'Regan - Cook
- Garfield Andrews - Simons
- Frank Knight - Orson Welles #1
- Corinne Conley - Mrs. Pennyworth
- Damon D'Oliveira - Alien #3
- Neil Vipond - Reverend
- John Evans - Colonel West
- John Evans - Jake
- Darren O'Donnell - Alien
- Joy Thompson - Mom
- Andrew Gunn - College Boy #2
- Frank Mancuso Jr.
- Susan Murdoch
- Rick Schwartz
Julian Richings hace el papel de Man with Hat.
Keram Malicki-Sánchez interpreta a Ceeto en la serie.
Richard Chaves interpreta a Colonel Paul Ironhorse en la serie.
Jaimz Woolvett interpreta a Larry en la serie.
Eric Keenleyside hace el papel de Foreman.
Jayne Eastwood interpreta a Grace en la serie.
Peter MacNeill interpreta a Director en la serie.
Michael Parks interpreta a Cash McCullough en la serie.
Gerry Quigley interpreta a Cab Driver en la serie.
Jared Martin interpreta a Harrison Blackwood en la serie.
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