- Jason Isaacs
- Â Mark Brydon 6 episodes, 2006
- Ben Daniels
- Â Nicholas Brocklehurst 6 episodes, 2006
- Eva Birthistle
- Â Jane Lavery 6 episodes, 2006
- Neil Pearson
- Â Phil Lonsdale 6 episodes, 2006
- Genevieve O'Reilly
- Â Caroline Hanley 6 episodes, 2006
- Sharon Gless
- Â Lynne Warner 6 episodes, 2006
- Noam Jenkins
- Â Christopher Styles 6 episodes, 2006
- Ted Whittall
- Â Gordon Adair 6 episodes, 2006
- Christopher Bolton
- Â Vinny Swain 6 episodes, 2006
- Nigel Bennett
- Â Charles Macintyre 6 episodes, 2006
- Marnie McPhail
- Â George Blake 6 episodes, 2006
- Alex Jennings
- Â James Sinclair 6 episodes, 2006
- Aaron Abrams
- Â Matthew Weiss 6 episodes, 2006
- Emma Campbell
- Â Sally Davis 5 episodes, 2006
- Rahnuma Panthaky
- Â Nasreen Qureshi 5 episodes, 2006
- Briony Glassco
- Â Jennifer 5 episodes, 2006
- Louca Tassone
- Â Azzam Sinclair 5 episodes, 2006
- Roman Podhora
- Â Vernon 4 episodes, 2006
- Michael Rhoades
- Â Gary Pritchard 4 episodes, 2006
- Lennie James
- Â Luke Gardner 4 episodes, 2006
- Ron Lea
- Â Carl Garcia 4 episodes, 2006
- Patrick Garrow
- Â Brad Godovsky 4 episodes, 2006
- David Eisner
- Â Sam Levinson 4 episodes, 2006
- Vijay Mehta
- Â Hassan Khan 3 episodes, 2006
- Peter Snider
- Â Macintyre's Lawyer 3 episodes, 2006
- Anita Carey
- Â Mrs. Gardner 3 episodes, 2006
- Rory O'Shea
- Â Anchor 2 / ... 3 episodes, 2006
- Wayne Downer
- Â Tim 3 episodes, 2006
- Todd Sandomirsky
- Â Terry Bennett / ... 3 episodes, 2006
- Peter James Haworth
- Â General Lane 3 episodes, 2006
- David Huband
- Â Warden Slake 3 episodes, 2006
- Joe Pingue
- Â Al Rivero 3 episodes, 2006
- Kevin Louis
- Â Airport Security / ... 2 episodes, 2006
- Jonathan Whittaker
- Â Anthony Hanley 2 episodes, 2006
- Paulino Nunes
- Â Eshan Borisvitch 2 episodes, 2006
- Cory Atkins
- Â Glen Laroche 2 episodes, 2006
- J.C. Kenny
- Â Jeb Starkey 2 episodes, 2006
- Glen Michael Grant
- Â Boston Customs Officer 2 episodes, 2006
- Daniela Lama
- Â Saida Sinclair 2 episodes, 2006
- Barry Flatman
- Â Governor Karpinski 2 episodes, 2006
- Arlene Duncan
- Â Female FBI agent 2 episodes, 2006
- Gabriel Demarco
- Â Soldier 1 1 episode, 2006
- Jason Burke
- Â Soldier 2 1 episode, 2006
- Kawa Ada
- Â Young Asian Male 1 episode, 2006
- Deepika Bhargava
- Â Young Asian Female 1 episode, 2006
- Yuri Tsivsivadze
- Â President Usman 1 episode, 2006
- Tom Shean
- Â Air Marshal 1 episode, 2006
- Maxine Dumont
- Â Beltway Injured Woman 1 episode, 2006
- Robert Gow
- Â Pilot 1 episode, 2006
- Matt Birman
- Â Mercenary 1 1 episode, 2006
- Brian Jagersky
- Â Mercenary 2 1 episode, 2006
- Tino Monte
- Â Anchor 1 1 episode, 2006
- Duncan McLeod
- Â Mercenary 3 1 episode, 2006
- Adam Growe
- Â John Struble 1 episode, 2006
- Andrea Moseanu
- Â Justine Cooke 1 episode, 2006
- Geoffrey Coulter
- Â Theatre Reporter 1 episode, 2006
- Kevin Hanchard
- Â Boston FBI Agent 1 episode, 2006
- Audrey Dwyer
- Â Harriet Walton 1 episode, 2006
- Maria Ricossa
- Â Madeleine Cohen 1 episode, 2006
- Desmond Campbell
- Â FBI Agent 1 episode, 2006
- Chris McGuire
- Â Richard Lawson 1 episode, 2006
- Briana Andrade-Gomes
- Â Macintyre's Daughter 1 episode, 2006
- Matthew G. Taylor
- Â Swain's Henchman 1 1 episode, 2006
- Paul Wardel
- Â Reporter 1 episode, 2006
- Kevin Rushton
- Â Swain's Henchman 2 1 episode, 2006
- Paul Stephen
- Â Ron Golmar 1 episode, 2006
- Bill Lake
- Â Head Joint Chiefs 1 episode, 2006
- Asim Wali
- Â Mehmet Saleh 1 episode, 2006
- Bradley Sawatzky
- Â Swain's Killer 1 episode, 2006
- Derek Scott
- Â Billy the Tramp 1 episode, 2006
- Brian Bisson
- Â Warners Secretary 1 episode, 2006
- Jack Hourigan
- Â Journalist 1 1 episode, 2006
- Jee-Yun Lee
- Â Anchor 3 1 episode, 2006
- W. Joseph Matheson
- Â Journalist 2 1 episode, 2006
- Simon Northwood
- Â Chemical Suit Man 1 episode, 2006
- Jack Duffy
- Â Mr. Walker 1 episode, 2006
- Ajay Fry
- Â Teenage Boy 1 episode, 2006
- Michael C. Newsome
- Â Airforce Chief of Staff unknown episodes
- Michael Sercerchi
- Â Business Man / ... (uncredited) 2 episodes, 2006
- Michael Comrie
- Â Congressman (uncredited) 1 episode, 2006
- Scott Murphy
- Â Soldier (uncredited) 1 episode, 2006
- Paul Mota
- Â General Glenn (uncredited) unknown episodes