| Stephen Amell | Oliver Queen /
Green Arrow |
| Katie Cassidy | Black Canary
(archive footage) |
| David Ramsey | John Diggle /
Spartan |
| Willa Holland | Thea Queen |
| Emily Bett Rickards | Felicity Smoak |
| John Barrowman | Malcolm Merlyn |
| Paul Blackthorne | Quentin Lance
(credit only) |
| Neal McDonough | Damien Darhk |
| Audrey Marie Anderson | Lyla Michaels |
| Eugene Byrd | Andy Diggle |
| Parker Young | Alex Davis |
| Gabriella Wright | Esrin Fortuna |
| Lynda Boyd | Phaedra Nixon |
| James Kidnie | Milo Armitage |
| Adrian Glynn McMorran | Michael Amar /
Murmur |
| Michael Bardach | Homeless Man |
| Jimmy Akingbola | Baron Reiter
(archive footage) (uncredited) |
| Manu Bennett | Slade Wilson
(archive footage) (uncredited) |
| Colin Donnell | Tommy Merlyn
(archive footage) (uncredited) |
| Elysia Rotaru | Taiana Venediktov
(archive footage) (uncredited) |
| Jamey Sheridan | Robert Queen
(archive footage) (uncredited) |
| Susanna Thompson | Moira Queen
(archive footage) (uncredited) |