Elenco Principal da Temporada 4

1. 

   Rufus Sewell

   Dr. Jacob Hood

2. 

   Marley Shelton

   Rachel Young

3. 

   Omar Benson Miller

   Felix Lee

4. Sarita Ospina

   Dead girl / Stand In

Convidados Especiais 21

1. 

   Sam Hennings

   Bill Larsson

2. 

   Joey Luthman

   Jesse Freeman

3. 

   Zach Mills

   Stephen Brown

4. 

   Erica Gimpel

   Lizzie Summers

5. 

   Jessica Hecht

   Beatrice Brown

6. 

   Henry G. Sanders

   Sam Tewsbury

7. 

   Daniel Roebuck

   Principal Craig

8. Reid Harper

   Freddy St. John

9. Edmund Wyson

   Mr. Harker

10. 

    Kelley Hazen

    Mrs. Harker

11. 

    Rick Cramer

    Mr. St. John

12. 

    Steven Wash Jr.

    Randy

13. Chip Hormess

    Wallace

14. 

    Kirk Bovill

    Concerned Father

15. Angela Hughes

    Concerned Mother

16. Christy Oldham

    Anna Freeman

17. 

    Tate Berney

    Calum Freeman

18. 

    Nicole J. Butler

    Lab Tech

19. Jarrod Bailey

    Daniel Harker

20. 

    Regina Hoyles

    Kid in Audience

21. Preston Corbell

    Brooks

Equipa Técnica 2