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 12

1. Avionne Dean

   Young Nora

2. 

   Islie Hirvonen

   Grace Gibbons

3. 

   Xander Hall

   Officer #1

4. Karin Inghammar

   Female Social Worker

5. 

   Jesse Stretch

   Truck

6. 

   Klarc Jerome Wilson

   Officer Jones

7. 

   Lossen Chambers

   Dr. Vanessa Ambres

8. 

   Robert Picardo

   Dexter Myles

9. 

   Chris Klein

   Orlin Dwyer / Cicada

10. 

    Victoria Park

    Kamilla Hwang

11. 

    Patrick Sabongui

    David Singh

12. 

    Morena Baccarin

    Gideon (voice) (uncredited)

Štáb 4