| Stephen Amell | Oliver Queen /
Green Arrow |
| Katie Cassidy | Laurel Lance /
Black Canary |
| David Ramsey | John Diggle /
Spartan |
| Willa Holland | Thea Queen /
Speedy |
| Emily Bett Rickards | Felicity Smoak |
| John Barrowman | Malcolm Merlyn
(credit only) |
| Paul Blackthorne | Quentin Lance |
| Neal McDonough | Damien Darhk |
| Grant Gustin | Barry Allen |
| Audrey Marie Anderson | Lyla Michaels |
| Cynthia Addai-Robinson | Amanda Waller |
| Enid-Raye Adams | Laura Hoffman |
| Alison Araya | Officer Lopez |
| Jason Deline | Adam Hoffman |
| Matt Hamilton | A.R.G.U.S. Agent |
| Danielle Kremeniuk | District Attorney |
| Jaeson Lee | Mercenary |
| Paolo Maiolo | Alvarez |
| Dean Marshall | Emergency Services |
| Jaiven Natt | Boy |
| Michael Patric | Comptroller |
| Brady Roberts | Skel |
| Maxwell Sloan Yip | Ghost
(as Maxwell Yip) |
| Luke Roessler | Young Boy
(uncredited) |
| Michael Rowe | Floyd 'Deadshot' Lawton
(archive footage) (uncredited) |