| Stephen Amell | Oliver Queen /
Green Arrow |
| David Ramsey | John Diggle |
| Willa Holland | Thea Queen |
| Emily Bett Rickards | Felicity Smoak |
| Echo Kellum | Curtis Holt |
| Paul Blackthorne | Quentin Lance |
| Rick Gonzalez | Rene Ramirez /
Wild Dog |
| Joe Dinicol | Ragman |
| Madison McLaughlin | Evelyn Sharp |
| Tyler Ritter | Detective Billy Malone |
| Chad L. Coleman | Tobias Church |
| Suki Kaiser | Janet Carroll |
| Garry Chalk | Lieutenant General J.G. Walker |
| David Nykl | Anatoly Knyazev |
| Houston Stevenson | Private Collins |
| Erin Aubrey | Doctor |
| Lauro David Chartrand-DelValle | Thug
(as Lauro Chartrand) |
| Vincent Dangerfield | Evan Wender |
| Kory Grim | Recruit #2 |
| Alexander Kalugin | Hooded Man |
| Alex Kyshkovych | Recruit #1
(as Oleksii Kyshkovych) |
| Michael Dorn | Prometheus
(voice) (uncredited) |