Elenco Principal da Temporada 8

1. 

   Melissa Benoist

   Kara Danvers / Supergirl / Kara Zor-El

2. 

   Chyler Leigh

   Alex Danvers / Sentinel

3. 

   David Harewood

   J'onn J'onzz / Martian Manhunter

4. 

   Katie McGrath

   Lena Luthor

5. 

   Jesse Rath

   Querl 'Brainy' Dox / Brainiac-5

6. 

   Nicole Maines

   Nia Nal / Dreamer

7. 

   Sam Witwer

   Ben Lockwood / Agent Liberty

8. 

   Mehcad Brooks

   James 'Jimmy' Olsen / Guardian

Convidados Especiais 16

1. 

   Rhona Mitra

   Mercy Graves

2. 

   Lynda Carter

   President Olivia Marsdin

3. 

   Vincent Gale

   Dr. Vose

4. 

   Cardi Wong

   Kesse Kay

5. 

   Tiya Sircar

   Fiona Byrne

6. 

   Alison Araya

   District Attorney Diaz

7. Daya Harris

   Old Woman

8. Takaya Kelly

   Little Girl

9. 

   Javier Lacroix

   Curator

10. 

    Latonya Williams

    Mom

11. 

    Anthony Konechny

    Raymond Jensen

12. 

    Sasha Piltsin

    Soldier

13. 

    Robert Baker

    Otis Graves

14. 

    Jaymee Mak

    MacKenzie

15. 

    Brenda Strong

    Lillian Luthor

16. 

    Keith Dallas

    Al

Equipa Técnica 7