| Name | Character | Episodes |
|---|---|---|
| Laura Haddock | Zoe Walker | 10 |
| Nuno Lopes | Boxer / Duarte Silva | 10 |
| Juan Diego Botto | Oriol Calafat | 10 |
| Daniel Mays | Marcus | 10 |
| Pedro Casablanc | Andreu Calafat | 10 |
| Tom Rhys Harries | Axel Collins | 10 |
| Belén López | Conchita Calafat | 10 |
| Marta Milans | Kika Calafat | 10 |
| Francis Magee | Clint Collins | 9 |
| Angela Griffin | Anna | 9 |
| Ceallach Spellman | Young Marcus | 9 |
| Laurence Fox | David | 7 |
| Barry Ward | Mike | 7 |
| Rafael Morais | Young Boxer | 6 |
| India Fowler | Young Zoe Walker | 5 |
| Maggie O'Neill | Yoana | 4 |
| Ginés García Millán | Rafael | 4 |
| Paulo Pires | George | 4 |
| Tallulah Evans | Jenny | 3 |
| Joonas Saartamo | Finnish Guy | 3 |
| Juan Carlos Vellido | Lieutenant | 3 |
| John McGlynn | Judge - Manchester | 1 |
| Marko Leht | Dragos | 1 |
| Jamie Bacon | Surfer | 1 |
| Vicente Vergara | Sicario 2 | 1 |
| Hannes Wegener | Israeli Guy | 1 |