| Stephen Amell | Oliver Queen /
Green Arrow |
| David Ramsey | John Diggle |
| Emily Bett Rickards | Felicity Smoak |
| Echo Kellum | Curtis Holt /
Mr. Terrific |
| Rick Gonzalez | Rene Ramirez /
Wild Dog |
| Juliana Harkavy | Dinah Drake /
Black Canary |
| Colton Haynes | Roy Harper /
Arsenal |
| Kirk Acevedo | Ricardo Diaz |
| Sea Shimooka | Emiko Queen |
| Katie Cassidy | Laurel Lance
(as Katie Cassidy Rodgers) |
| Grant Gustin | Barry Allen |
| Paul Blackthorne | Quentin Lance |
| Willa Holland | Thea Queen |
| Caity Lotz | Sara Lance |
| Katherine McNamara | Maya |
| Joe Dinicol | Rory Regan /
Ragman |
| Bex Taylor-Klaus | Sin |
| Laara Sadiq | Mayor Emily Pollard |
| Venus Terzo | Dr. Elisa Schwartz |
| Joseph David-Jones | Connor Hawke /
Green Arrow |
| Eliza Faria | Zoe Ramirez |
| Jessica Heafey | Documentarian |
| Jack Moore | William Clayton |
| Evan Roderick | Officer Nick Anastas |
| Kelsey Grammer | Narrator
(voice) (uncredited) |