Season Regulars 4

1. 

   Anna Torv

   Olivia Dunham

2. 

   Joshua Jackson

   Peter Bishop

3. 

   John Noble

   Walter Bishop

4. 

   Jasika Nicole

   Astrid Farnsworth

Guest Stars 23

1. 

   Lance Reddick

   Phillip Broyles

2. 

   Seth Gabel

   Lincoln Lee

3. 

   Michael Cerveris

   The Observer / September

4. 

   Sarwan Badesha

   Alt Universe Fringe Agent #2

5. Natalie Brooke Edwards

   Young Fringe Agent

6. Jonathan Fitzgerald

   Observer #2

7. 

   Peter Flemming

   Loyalist Lieutenant

8. 

   Craig Fraser

   Loyalist Guard #1

9. 

   Mackenzie Gray

   Observer Physician #1

10. Rustin Gresiuk

    Trevor

11. 

    Peter Kelamis

    Tobin

12. 

    Tara Pratt

    Alt Universe Fringe Agent #1

13. 

    Ivan Wanis-Ruiz

    Amon

14. 

    Lucas Wolf

    Observer Physician #2

15. Andrea Yu

    Alt Universe Fringe Agent #4

16. Vanessa Zachos

    Loyalist Nurse

17. 

    Michael Kopsa

    Captain Windmark

18. Abagayle Hardwick

    Young Etta

19. 

    Eugene Lipinski

    December

20. Rowan Longworth

    Michael

21. 

    Jordan Schartner

    Observer

22. 

    James Kidnie

    The Commander

23. Simon Hill

    Observer Surgeon

Crew 2