Season Regulars 18

1. 

   Pablo Schreiber

   Master Chief, Spartan-117 / John-117

2. 

   Natascha McElhone

   Dr. Catherine Halsey

3. 

   Joseph Morgan

   James Ackerson

4. 

   Shabana Azmi

   Margaret Parangosky

5. 

   Christina Bennington

   Cortana

6. 

   Natasha Culzac

   Riz-028

7. 

   Olive Gray

   Dr. Miranda Keyes

8. 

   Yerin Ha

   Kwan Ha

9. 

   Bentley Kalu

   Vannak-134

10. 

    Kate Kennedy

    Kai-125

11. 

    Charlie Murphy

    Makee

12. 

    Fiona O'Shaughnessy

    Laera

13. 

    Cristina Rodlo

    Corporal Talia Perez

14. 

    Danny Sapani

    Jacob Keyes

15. 

    Jen Taylor

    Cortana (voice)

16. 

    Viktor Åkerblom

    Arbiter Var 'Gatanai

17. 

    Tylan Bailey

    Kessler

18. 

    Bokeem Woodbine

    Soren-066

Guest Stars 8

1. 

   Olwen Fouéré

   The Mother

2. 

   Dani Klupsch

   Lt Mullins

3. 

   Ailsa Davidson

   Tech Smith

4. 

   Tom Gaskin

   Tech Jones

5. 

   Harry Lloyd

   343 Guilty Spark (voice)

6. 

   Audrey Brisson-Jutras

   Janine

7. 

   Amro Mahmoud

   Lead Scientist

8. 

   Zsófia Bach

   Scientist

Crew 3