Main Cast[]
Recurring Cast[]
- Ed Quinn as Nathan Stark (32 episodes, 2006-2012)
- Debrah Farentino as Beverly Barlowe (25 episodes, 2006-2012)
- Tembi Locke as Grace Monroe (24 episodes, 2010-2012)
- Christopher Jacot as Larry Haberman (24 episodes, 2007-2012)
- Kavan Smith as Deputy Andy 2.0 / ... (21 episodes, 2010-2012)
- Felicia Day as Holly Marten (18 episodes, 2011-2012)
- Matt Frewer as Jim Taggart (18 episodes, 2006-2012)
- Trevor Jackson as Kevin Blake (16 episodes, 2010-2012)
- Jaime Ray Newman as Tess Fontana (12 episodes, 2009-2010)
- Vanya Asher as Lucas (12 episodes, 2007-2009)
- Wil Wheaton as Isaac Parrish (12 episodes, 2010-2012)
- James Callis as Dr. Trevor Grant / ... (10 episodes, 2010-2012)
- Meshach Peters as Kevin Blake (10 episodes, 2006-2008)
- Frances Fisher as Eva Thorne (9 episodes, 2008-2009)
- Ever Carradine as Lexi Carter (8 episodes, 2008-2009)
- Barclay Hope as Gen. Mansfield (8 episodes, 2007-2010)
- Shayn Solberg as Spencer Martin (8 episodes, 2006-2009)
- Ming-Na Wen as U.S. Senator Michaela Wen (7 episodes, 2011-2012)
- Adrienne Carter as Pilar (6 episodes, 2007-2010)
- Jackie Gonneau as Computer Voice / ... (6 episodes, 2011-2012)
- Bryan Wilson as Baker Twin #2 / ... (6 episodes, 2006-2012)
- Keith Wilson as Baker Twin #1 / ... (6 episodes, 2006-2012)
- Tamlyn Tomita as Kim Anderson / ... (5 episodes, 2006-2009)
Guest actors[]
- Wesley Salter as Technician / (5 episodes, 2010-2012)
- Bridget Hoffman as Computer Voice / (5 episodes, 2008-2009)
- Martin Cummins as Dekker (4 episodes, 2011-2012)
- Jordenn Thompson as Jenna / (4 episodes, 2012)
- Paula Lindberg as Neural Engineer #1 / (4 episodes, 2011-2012)
- Roger Cross as Major William Shaw (3 episodes, 2012)
- Sonja Bennett as Callie Curie (3 episodes, 2007)
- Alan Legros as Seth Osbourne (3 episodes, 2006-2009)
- Wallace Shawn as Dr. Warren Hughes / (3 episodes, 2011-2012)
- Nevaeh Kidd as Jenna Blake (3 episodes, 2011-2012)
- Elias Toufexis as Adam Barlowe (3 episodes, 2010)
- Martin Christopher as Doctor / (3 episodes, 2007-2009)
- Leo Li Chiang as GD Section 5 Guard / (3 episodes, 2011-2012)
- Olivia d'Abo as Dr. Abby Carter (2 episodes, 2007)
- Chris Parnell as Dr. Noah Drummer (2 episodes, 2010-2011)
- Ty Olsson as Deputy Andy / (2 episodes, 2009-2010)
- Leela Savasta as Julia Golden (2 episodes, 2009)
- Jeff Pangman as Duncan (2 episodes, 2009)
- Noah Danby Major Ryan (2 episodes, 2010)
- Craig Anderson as Dr. Nick Fowler (2 episodes, 2012)
- Garwin Sanford as Congressman Faraday (2 episodes, 2006-2007)
- Robert Clarke as Larry the IT Guy (2 episodes, 2006)
- Rob LaBelle as Walter Perkins (2 episodes, 2006)
- Lexa Doig as Dr. Anne Young (2 episodes, 2007-2008)
- Jennifer Clement as Susan Perkins (2 episodes, 2006)
- Gabrielle Rose as Carol Taylor (2 episodes, 2007-2008)
- Kim Poirier as Dr. Maria Leonardo (2 episodes, 2009-2011)
- Michael Brock as Jasper Cole (2 episodes, 2007)
- Ben Ratner as Dr. Fung (2 episodes, 2011-2012)
- Paul Moniz de Sa Paul as Lincoln (2 episodes, 2007-2008)
- Andrew Cownden as Chem Tech / (2 episodes, 2009-2012)
- Alex Ferris as Boy / (2 episodes, 2010-2011)
- Zak Ludwig as Brian Perkins (2 episodes, 2006)
- Marie West as Singer (2 episodes, 2010)
- Raugi Yu as GD Tech / (2 episodes, 2007-2010)
- Michael Kopsa as Doctor (2 episodes, 2007)
- Karissa Tynes as Stephanie (2 episodes, 2007)
- Paul Lazenby as MP / (2 episodes, 2010)
- Isaiah Adam as Soldier / (2 episodes, 2010)
- Cameron Park as Doctor / (2 episodes, 2007)
- Sharon Taylor as Stark's Doctor / (2 episodes, 2007)
- Rif Hutton as Astraeus Computer / (2 episodes, 2011-2012)
- Ileeya Brown as Jenna (2 episodes, 2012)
- Jocelyne Loewen as Doris Gilmer / (2 episodes, 2006)
- Nico Cortez as Jo's Dad (2 episodes, 2011-2012)
- Christina Sicoli as Desperate Citizen / (2 episodes, 2011-2012)
- Greg Germann as Professor Warren King (1 episode, 2006)
- Billy Campbell as Dr. Bruce Manlius (1 episode, 2009)
- Antony Holland as Dr. Irvin Thatcher (1 episode, 2006)
- Tygh Runyan as Pierre Fargo (1 episode, 2007)
- Richard Side as Dr. Kinnison (1 episode, 2009)
- Allison Scagliotti as Claudia Donovan (1 episode, 2010)
- Stan Lee as Dr. (Generalissimo) Lee (1 episode, 2011)
- Dondre Whitfield as Dr. Marcus Blake (1 episode, 2012)
- Andrew Airlie as Jason Anderson (1 episode, 2006)
- David Paetkau as Callister Raynes (1 episode, 2006)
- Vincent Gale as Dr. Todd (1 episode, 2007)
- Anna Galvin as Dr. Jane Harrington (1 episode, 2007)
- Scott Hylands as Andre Sandrov (1 episode, 2007)
- Teryl Rothery as Diane Lancaster (1 episode, 2007)
- Alan Ruck as Dr. Hood (1 episode, 2008)
- Jillian Fargey as Dr. Ashe (1 episode, 2009)
- Ben Geldreich as Dr. Lieber (1 episode, 2009)
- Eugene Byrd as Dr. Michael Clark (1 episode, 2012)
- Michael Coleman as Pizza Dude (1 episode, 2006)
- Saul Rubinek as Dr. Carl Carlson (1 episode, 2006)
- Tom Tames as Dylan Hartwell (1 episode, 2006)
- Donna White as Eugenia (1 episode, 2006)
- Elise Gatien as Megan (1 episode, 2007)
- Patrick Gilmore as Pete Puhlman (1 episode, 2007)
- Allison Hossack as Dr. Emily Glenn (1 episode, 2007)
- Michael Shanks as Christopher Dactylos (1 episode, 2007)
- Brendan Beiser as Dr. Drechmeyer (1 episode, 2009)
- Glynis Davies as Toaster Owner (1 episode, 2009)
- Eric Hempsall as Dr. Wyman (1 episode, 2009)
- Laura Mennell as Dr. Rivers (1 episode, 2009)
- Aaron Douglas as Dr. Ray Darlton (1 episode, 2011)
- Donavon Stinson as Dr. Max Dillon (1 episode, 2011)
- Maury Chaykin as Major William Cobb / (1 episode, 2006)
- Samuel Patrick Chu as Putnam (1 episode, 2006)
- Arthur Corber as Scientist in Explosion (1 episode, 2006)
- David Quinlan as Dr. Milton Houk (1 episode, 2006)
- Fulvio Cecere as Jake Wyatt (1 episode, 2007)
- Barbara Eve Harris as Reverend Harper (1 episode, 2007)
- Terence Kelly as Charlie (1 episode, 2007)
- Bill Mondy as Sam Lovejoy (1 episode, 2007)
- Syn Narula as Dr. Babajanian (1 episode, 2007)
- Stefanie von Pfetten as Wendy Whiticus (1 episode, 2007)
- Nicholas Carella as Leo Weinbrenner (1 episode, 2008)
- Holly Elissa as Dr. Tracy Fox (1 episode, 2008)
- Chelah Horsdal as Mary-Beth Curtis (1 episode, 2009)
- Sean Owen Roberts as Toby Bismarck (1 episode, 2009)
- Stefanie Samuels as Dr. Draper (1 episode, 2009)
- Tobias Slezak as Dr. Jacob Stefano (1 episode, 2009)
- Olivia Cheng as Dr. Lisa Wheeler (1 episode, 2010)
- Rocky Anderson as Helicopter Pilot (1 episode, 2011)
- Andrew McNee as Huggins (1 episode, 2011)
- Forbes Angus as Dr. Selikoff (1 episode, 2012)
- Aliyah O'Brien as Female Driver (1 episode, 2012)
- Michael Benyaer as Dr. Louis Glazer (1 episode, 2006)
- Rukiya Bernard as IT Technician (1 episode, 2006)
- Colin Foo as Scientist Teaching Zoe #1 (1 episode, 2006)
- Aaron Isaacs as Walter Perkins (1 episode, 2006)
- Ryan Vrba as Puck (1 episode, 2006)
- Deirdre Blades as Belle St. John (1 episode, 2007)
- Colin Cunningham as Dr. Paul Suenos (1 episode, 2007)
- Ed Hong-Louie as Man at Bar (1 episode, 2007)
- David Lewis as Dr. Aaron Finn (1 episode, 2007)
- David Nykl as Dr. Steven Whiticus (1 episode, 2007)
- Don Thompson as Victor (1 episode, 2007)
- Mark Hildreth as Chuck (1 episode, 2008)
- Dean Marshall as Dr. Herrera (1 episode, 2008)
- Elysia Rotaru as Teri Wallace (1 episode, 2008)
- Zak Santiago as Dr. Sebastian Marx (1 episode, 2008)
- Jonathon Young as Dr. Ethan Edison (1 episode, 2008)
- Julia Arkos as Dr. Bella Pagani (1 episode, 2009)
- Jay Brazeau as Captain Yuri Gregor (1 episode, 2009)
- Jennifer Crystal Foley as Tabitha (1 episode, 2009)
- Mark Gash as H.J. Johnson (1 episode, 2009)
- Jennifer Spence as Dr. Monroe (1 episode, 2009)
- Keegan Connor Tracy as Dr. Viccelli (1 episode, 2010)
- Graeme Duffy as Dr. Norman Gregor (1 episode, 2011)
- Quinn Lord as Young Zane (1 episode, 2011)
- Edward James Olmos as First sled dog (1 episode, 2011)
- Debbie Timuss as Officer (1 episode, 2011)
- Revard Dufresne as Guard (1 episode, 2012)
- Layla Alizada as Dr. Sharat (1 episode, 2006)
- Amber Borycki as Cybernetic Fairy (1 episode, 2006)
- John Burnside as Scientist Teaching Zoe #2 (1 episode, 2006)
- Garry Chalk as Colonel Briggs (1 episode, 2006)
- Sean Devine as Bus Driver (1 episode, 2006)
- Yvonne Myers as Global Dynamics Human Resource Counselor (1 episode, 2006)
- Aleks Paunovic as Global Security Officer (1 episode, 2006)
- Gary Sekhon as Kellor (1 episode, 2006)
- Richard Arndt as someone (1 episode, 2007)
- Eileen Barrett as Judy Stone (1 episode, 2007)
- Adam Bergquist as Mr. Hall (1 episode, 2007)
- Brenda Crichlow as Principal Wallace (1 episode, 2007)
- Carmen Moore as Dr. Childress (1 episode, 2007)
- Margot Berner as Kylie (1 episode, 2008)
- Adrian Hough as Dr. Wilding (1 episode, 2008)
- Richard Kahan as Derek Bowers (1 episode, 2008)
- David Richmond-Peck as Dr. Hendricks (1 episode, 2008)
- Kirsten Robek as Mina (1 episode, 2008)
- Kevin Kruchkywich as Dr. Fielding (1 episode, 2009)
- Meredith McGeachie as Dr. Bell (1 episode, 2009)
- Jonathan Nichols as Announcer (1 episode, 2009)
- Darryl Scheelar as Ranger Tom (1 episode, 2009)
- Michelle Harrison as Lily Morgan (1 episode, 2010)
- Ava Hughes as Girl (1 episode, 2010)
- John Reardon as Dr. Derek Thergood (1 episode, 2010)
- Ben Wilkinson as Dr. Anson (1 episode, 2010)
- Cameron Bancroft as Dad (1 episode, 2011)
- Luke Camilleri as Dr. Welke (1 episode, 2011)
- Dave Foley as Dr. Plotkin (1 episode, 2011)
- Natalie Gibson as Panicked Patron (1 episode, 2011)
- Ellie Harvie as Dr. Sanagustin (1 episode, 2011)
- Pablo Silveira as Tech #2 (1 episode, 2011)
- Fane Tse as Candidate #1 (1 episode, 2011)
- John Paul McGlynn as Med Tech (1 episode, 2012)
- Erin Simms as Young Scientist (1 episode, 2012)
- Mark Burgess as Man Getting Ticket (1 episode, 2006)
- Alex Diakun as (1 episode, 2006)
- Randal Edwards as Lab Tech (1 episode, 2006)
- Nathan Kelly as (1 episode, 2006)
- Daryl Shuttleworth as Global Security Tactical Commander (1 episode, 2006)
- Kenneth W. Yanko as Lt. General (1 episode, 2006)
- James Ashcroft as Male Nurse (1 episode, 2007)
- Paul Christie as Dr. Ryan Brock (1 episode, 2007)
- Richard Ian Cox as Dr. Bob Stone (1 episode, 2007)
- Matreya Fedor as Tina (1 episode, 2007)
- Sarah Hayward as Madame (1 episode, 2007)
- Tyronne L'Hirondelle as (1 episode, 2007)
- Steve Makaj as Rudolph (1 episode, 2007)
- Kevin O'Grady as Technician (1 episode, 2007)
- Julius Chapple as Guard (1 episode, 2008)
- Tricia Collins as Eileen Michaels (1 episode, 2008)
- Shawn Macdonald as Dr. Mendel (1 episode, 2008)
- Jody Racicot as Doctor Peterson (1 episode, 2008)
- Malcolm Stewart as Rick Wallace (1 episode, 2008)
- D. Harlan Cutshall as GD Demo Team Leader (1 episode, 2009)
- John DeSantis as Big Ed (1 episode, 2009)
- Rachel Gassi as The Dress Lady (1 episode, 2009)
- Stephanie Belding as Dr. Tanya Zimmer (1 episode, 2010)
- Stacee Copeland as GD Nurse (1 episode, 2010)
- Jamie Kennedy as Dr. Ramsey (1 episode, 2010)
- Kathryn Kirkpatrick as Patient (1 episode, 2010)
- Norman Misura as Irate Customer (1 episode, 2010)
- Jill Morrison as Supply Clerk (1 episode, 2010)
- Matthew Thiessen as Scientist #1 (1 episode, 2010)
- Darren Dolynski as Dr. Boyle (1 episode, 2011)
- Nicholas Elia as Young Parrish (1 episode, 2011)
- Andrew Coghlan as Grief Tech #1 (1 episode, 2012)
- Justin Kim as Medic (1 episode, 2012)
- Sunita Prasad as Boxed Hand Tech (1 episode, 2012)
- C. Douglas Quan as Dr. Horikoshi (1 episode, 2012)
- J.R. Messado as Kevin Blake (1 episode, 2006)
- Graham Young as Unidentified (1 episode, 2006)
- Michael Bean as Husband (1 episode, 2007)
- Maria Luisa Cianni as Miss Nelson (1 episode, 2007)
- Rob Hayter as FBI Agent #2 (1 episode, 2007)
- Sean Millington as Global Security Officer (1 episode, 2007)
- Iris Paluly as Home Owner (1 episode, 2007)
- Stephen Powell as Unidentified (1 episode, 2007)
- Kayla Doerksen as Sales Lady (1 episode, 2008)
- Woody Jeffreys as Bob Nobb (1 episode, 2008)
- David Mackay as Doctor Gaz (1 episode, 2008)
- Stacey Bendfelt as GD Gym Manager (1 episode, 2009)
- Kurt Max Runte as Agent Turner (1 episode, 2009)
- Kameron Louangxay as Scientist #2 (1 episode, 2010)
- Fiona Vroom as GD Employee (1 episode, 2010)
- Marie Avgeropoulos as Bonnie (1 episode, 2011)
- Peter Kelamis as Dr. Mark Timmons (1 episode, 2011)
- Peter Ciuffa as Grief Tech #2 (1 episode, 2012)
- Patricia Isaac as Med Tech (1 episode, 2012)
- Jeffrey Kaiser as GD Tech NPC (1 episode, 2012)
- Laura Adkin as Cheerleader #1 (1 episode, 2006)
- Alison Araya as Parishioner (1 episode, 2007)
- Jordan Asch as(1 episode, 2007)
- Lossen Chambers as Nurse (1 episode, 2007)
- Max Fomitchev as Neil Baxter (1 episode, 2007)
- Paul Herbert as Epigeneticist (1 episode, 2007)
- Eric Hui as Medical Doctor (1 episode, 2007)
- Daniel Pepper as D.O.D. Agent (1 episode, 2007)
- Kaaren de Zilva as Doctor Lee (1 episode, 2008)
- Jax Smith as Grace (1 episode, 2008)
- Chad Bellamy as GD Guard - Frank (1 episode, 2010)
- Dalias Blake as Construction Worker #1 (1 episode, 2010)
- Don Hastings as Baseball Game Announcer (1 episode, 2010)
- Alex Hospes as Cookie Eating Boy (1 episode, 2010)
- Phillip Mitchell as Soldier #1 (1 episode, 2010)
- Keenan Tracey as Jake (1 episode, 2010)
- Max Boateng as Nurse (1 episode, 2011)
- Aubrey Tennant as Balloon Man (1 episode, 2011)
- Grant Imahara as EMO Robot Scientist (1 episode, 2012)
- Jason Poulsen as Dr. Wells (1 episode, 2012)
- Katie Chapman as Cheerleader #2 (1 episode, 2006)
- Reese Alexander as Security Officer (1 episode, 2007)
- Dorla Bell as Zoe's Friend #3 (1 episode, 2007)
- Patrick Keating as (1 episode, 2007)
- David Stuart as Pharmacist (1 episode, 2007)
- Neil Schell as Abe (1 episode, 2008)
- Bella King as Jessica Lansky (1 episode, 2010)
- Jerry Rector as Construction Worker #2 (1 episode, 2010)
- Joel Semande as Male Student (1 episode, 2010)
- Blaine Anderson as Candidate (1 episode, 2011)
- Dan Clarke as Faux-Bama (1 episode, 2011)
- Tammy Hui as Teacher (1 episode, 2011)
- Demord Dann as GD Guard NPC (1 episode, 2012)
- Jonathan Holmes as Consortium #1 (1 episode, 2012)
- Troy Rudolph as Crewman Tuchman (1 episode, 2012)
- Elizabeth Thai as Dr. Yoo (1 episode, 2012)
- Matt McInnis as Young Thatcher (1 episode, 2006)
- Benjamin B. Smith as Oppenheimer (1 episode, 2006)
- Daniel Boileau as Man Arguing with Wife (1 episode, 2007)
- Anna Cummer as EMT Nurse (1 episode, 2007)
- Dave Leach as Marco Polo #1 (1 episode, 2007)
- Patricia Harras as Laura Wallace (1 episode, 2008)
- Nickolas Baric as MP #1 (1 episode, 2010)
- Christie Burke as College Girl (1 episode, 2010)
- Finn Michael as Scientist (1 episode, 2010)
- Harrison Xu as Tesla Kid #1 (1 episode, 2010)
- Tina Milo Milivojevic as Scientist #1 (1 episode, 2011)
- Kevin Mundy as Military Guard (1 episode, 2011)
- Geoff Gustafson as Dr. Tuchman (1 episode, 2012)
- Ian Carter as Chief Marshal (1 episode, 2006)
- Tyla Gagnon as Young Eugenia (1 episode, 2006)
- Tanya Champoux as Woman Arguing with Husband (1 episode, 2007)
- Nhi Do as Zoe's Friend #2 (1 episode, 2007)
- J.B. McEown as Kid in Park (1 episode, 2007)
- Stephen Park as Marco Polo #2 (1 episode, 2007)
- Aleksandra Rea as Spa Attendant (1 episode, 2007)
- Tiara Sorensen as Sweater Girl (1 episode, 2010)
- Todd Mason as Scientist #2 (1 episode, 2011)
- Jonathan Potts as Dr. Curtis Ward (1 episode, 2011)
- Sarah Afful as Cop (1 episode, 2012)
- Matthew Hastings as Robert the Moving Boss (1 episode, 2012)
- Kwesi Ameyaw as Special Agent Hicks (1 episode, 2006)
- Aaron Rota as Man In Yellow Shirt (1 episode, 2006)
- Storma as Media Store Clerk (1 episode, 2007)
- Eddie Frierson as Radio Announcer (1 episode, 2010)
- Jessica Gonzales as Young Jo (1 episode, 2011)
- Christina Jastrzembska as Old Woman (1 episode, 2012)
- Leanne Merrett as Special Agent Miller (1 episode, 2006)
- Nancy J. Lilley as Upset Wife (1 episode, 2007)
- Chris Burns as Buzz (1 episode, 2006)
- Alison Raine as Woman in Purple Sweater (1 episode, 2007)
- Nico McEown as Rico (1 episode, 2011)
- Viv Leacock as Array Guard #1 (1 episode, 2012)
- Tyler McClendon as Young Corporal (1 episode, 2006)
- Donna Yamamoto as Woman Arguing with Friend (1 episode, 2007)
- Peter Bundic as Eddie (1 episode, 2011)
- Jason Griffith as Array Guard #2 (1 episode, 2012)
- Alexander Kambolis as Juan (1 episode, 2011)
- Kevin D. Murray as Charley (1 episode, 2006)
- Michelle Creber as Radical Racoon Teammate (1 episode, 2011)
- Michael Warren Choi as Awesome Possum #1 (1 episode, 2011)
- Tessamay Hartley as Awesome Possum #2 (1 episode, 2011)
- Alyssia Ellis as Awesome Possum #3 (1 episode, 2011)
- Laura Jaye as Woman (1 episode, 2007)
- Chad Riley as Guard (1 episode, 2008)
- Wanda Ayala as Researcher (1 episode, 2009)
- Heather Doerksen as Woman #2 (1 episode, 2009)
- Nicholas Longstaff as The Mail Carrier (1 episode, 2009)
- Seth Robert Dusky as Additional voices (1 episode, 2011)
- Jim Parsons as Carl the Jeep (1 episode, 2011)
- Peter Brown as Med Tech (uncredited) (9 episodes, 2012)
- Damon Winters as Field Scientist (uncredited) (2 episodes, 2011)
- Christopher Ang as Interrogatee (uncredited) (1 episode, 2006)
- Chris Becker as Darren (uncredited) (1 episode, 2006)
- Sean Kohnke as Researcher #1 (uncredited) (1 episode, 2006)
- Mike Vardy as Lab Employee (uncredited) (1 episode, 2006)
- Bonnie Smart as Female Tech (uncredited) (1 episode, 2007)
- Jaime Paglia as I.S.S. Crew (uncredited) (1 episode, 2011)
- Nathan Lehfeldt as DOD Attaché (uncredited) (1 episode, 2012)
