Season Regulars 4

1. 

   David James Elliott

   Harmon Rabb

2. 

   Catherine Bell

   Sarah MacKenzie

3. 

   Patrick Labyorteaux

   Bud Roberts

4. 

   John M. Jackson

   AJ Chegwidden

Guest Stars 19

1. 

   Louis Herthum

   Communications Officer

2. 

   K Callan

   Esther Gale

3. 

   Bernard White

   Sadik Fahd

4. 

   Louis Aguirre

   Alvaro Camacho

5. 

   Steven Culp

   Clayton Webb

6. 

   Randy Vasquez

   Victor 'Gunny' Galindez

7. 

   Isabella Hofmann

   Meredith Cavanaugh

8. 

   Jameson Parker

   Harrison Kershaw

9. 

   Karri Turner

   Harriet Sims

10. 

    Marco Rodríguez

    Raul Garcia

11. David Ackert

    Wahib Shawaf

12. 

    Ali Afshar

    Sadik's Henchman

13. 

    Laura Putney

    Catherine Gale

14. 

    Brian McNamara

    Andrew Gale

15. 

    Jack Stehlin

    Edward Hardy

16. 

    D.C. Douglas

    Dr. Alan Ganzel

17. 

    Donald Sage Mackay

    Pilot

18. 

    Kayla Blake

    Secretary to Catherine Gale

19. 

    Nigel Gibbs

    Drone Operator

Crew 3