Pravidelné obsazení sezóny 9

1. 

   Grant Gustin

   Barry Allen / The Flash

2. 

   Candice Patton

   Iris West-Allen

3. 

   Danielle Panabaker

   Dr. Caitlin Snow / Killer Frost

4. 

   Danielle Nicolet

   Cecile Horton

5. 

   Carlos Valdes

   Cisco Ramon / Vibe

6. 

   Hartley Sawyer

   Ralph Dibny / Elongated Man

7. 

   Jesse L. Martin

   Joe West

8. 

   Jessica Parker Kennedy

   Nora West-Allen / XS

9. 

   Tom Cavanagh

   Harrison 'Sherloque' Wells

Hostující obsazení epizody 10

1. 

   Kathryn Gallagher

   Lia Nelson

2. Kindall Charters

   August Heart

3. 

   Everick Golding

   Trevor Shinick

4. 

   BD Wong

   Godspeed (voice)

5. 

   Ese Atawo

   Detective Frankie Curtis

6. 

   Fraser Corbett

   Bank Guard

7. Garry Garneau

   Uni #1

8. 

   Robert Picardo

   Dexter Myles

9. 

   Andy Thompson

   Dr. Bruce Bonwitt

10. 

    Morena Baccarin

    Gideon (voice) (uncredited)

Štáb 4