| Stephen Amell | Oliver Queen /
Green Arrow |
| Katie Cassidy | Laurel Lance
(credit only) |
| David Ramsey | John Diggle /
Spartan |
| Willa Holland | Thea Queen |
| Emily Bett Rickards | Felicity Smoak |
| John Barrowman | Malcolm Merlyn |
| Paul Blackthorne | Quentin Lance |
| Neal McDonough | Damien Darhk |
| Vinnie Jones | Danny 'Brick' Brickwell |
| Audrey Marie Anderson | Lyla Michaels |
| Jimmy Akingbola | Baron Reiter |
| Parker Young | Alex Davis |
| Alexander Calvert | Lonnie Machin |
| Tom Amandes | Noah Kuttler |
| Adrian Glynn McMorran | Michael Amar /
Murmur |
| Elysia Rotaru | Taiana Venediktov |
| Charlotte Ross | Donna Smoak |
| Christopher Ang | Technician #1
(as Chris Ang) |
| Dmitry Chepovetsky | General Vadimov |
| Dean McKenzie | Dennis
(as Dean Monroe McKenzie) |
| David Pérez | Technician #2
(as David Perez) |
| Andre Roshkov | Engineer Antonov |
| Robin Wilcock | Prisoner |