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 13

1. 

   Azie Tesfai

   Kelly Olsen / Guardian

2. 

   Bruce Boxleitner

   President Baker

3. 

   Jill Morrison

   Bitsie Teschmacher

4. 

   Graham Verchere

   George Lockwood

5. 

   April Parker Jones

   Colonel Lauren Haley

6. 

   Carl Lumbly

   Myr'nn J'onzz

7. 

   卡琳·科諾瓦

   Senator Granberry

8. 

   Sunny Chen

   Passerby

9. 

   Donna Benedicto

   DEO Agent

10. 

    Françoise Robertson

    Sarah Walker

11. 

    Andrea Brooks

    Eve Tessmacher

12. 

    Jaymee Mak

    MacKenzie

13. 

    Brenda Strong

    Lillian Luthor

Equipa Técnica 5