| Stephen Amell | Oliver Queen /
Green Arrow |
| David Ramsey | John Diggle /
Spartan |
| Willa Holland | Thea Queen
(credit only) |
| Emily Bett Rickards | Felicity Smoak |
| Echo Kellum | Curtis Holt /
Mr. Terrific |
| Rick Gonzalez | Rene Ramirez /
Wild Dog |
| Juliana Harkavy | Dinah Drake /
Black Canary |
| Katie Cassidy | Laurel Lance /
Black Siren
(credit only) |
| Paul Blackthorne | Quentin Lance |
| David Nykl | Anatoly Knyazev |
| Sydelle Noel | Samanda Watson |
| Venus Terzo | Dr. Schwartz |
| Keri Adams | Bethany Snow |
| Jarryd Baine | Reporter #2 |
| Sydney Bell | Reporter #3 |
| Brad Bergeron | Junior Agent |
| Gregory S. Csiszar | Markovian Executive
(as Greg Csiszar) |
| Rick Dobran | Alec Tarkov |
| Jack Moore | William Clayton |
| Lisa Penz | Reporter #1
(uncredited) |