Stała obsada sezonu 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. 

   Odette Annable

   Samantha Arias / Reign

6. 

   Chris Wood

   Mon-El

7. 

   Jeremy Jordan

   Winn Schott

8. 

   Mehcad Brooks

   James 'Jimmy' Olsen / Guardian

Goście specjalni 7

1. 

   Georgia Hacche

   Woman

2. 

   Andres Joseph

   Man

3. 

   Emma Tremblay

   Ruby Arias

4. 

   Amy Jackson

   Imra Ardeen

5. 

   Anjali Jay

   Selena

6. 

   Carl Lumbly

   Myr'nn J'onzz

7. 

   Betty Buckley

   Patricia Arias

Ekipa 4