Season Regulars 4

1. 

   Eric McCormack

   Dr. Daniel Pierce

2. 

   Rachael Leigh Cook

   Kate Moretti

3. 

   Kelly Rowan

   Natalie Vincent

4. 

   Arjay Smith

   Max Lewicki

Guest Stars 16

1. 

   Jonathan Scarfe

   Roger Probert

2. 

   Freddy Rodríguez

   Wesley Sumter

3. 

   Jayne Atkinson

   Helen Paulson

4. 

   Jimmy Bennett

   Alex Willingham

5. 

   Steven Culp

   John F. Kennedy

6. 

   Nicole de Boer

   Janice Zimmerman

7. 

   Matthew Glave

   Senator Scott Ryland

8. 

   Bridget Regan

   Victoria Ryland

9. 

   Michael B. Silver

   Lawrence Crawford

10. 

    Dave Thomas

    Bill Duffy

11. 

    Hira Ambrosino

    Dr. Susan Hansen

12. 

    Kieron Elliott

    Dr. Jonathan Ingbar

13. 

    Whitney Avalon

    Psych Nurse

14. David Farkas

    FBI Agent

15. Jeff Kueppers

    EMT

16. Jules Theodore

    Security Guard

Crew 3