| Name | Character | Episodes |
|---|---|---|
| Will Thorp | Dexter | 6 |
| Richard Lintern | Edward Finnigan | 6 |
| Victor McGuire | Ruben Frey | 6 |
| Leon Herbert | Vernon Eriksen | 6 |
| Freddie Wise | John Frey | 6 |
| Katie Brayben | Hanna | 6 |
| Sara Stewart | Alice Finnigan | 1 |
| Lily Dodsworth-Evans | Elisabeth Finnigan | 1 |
| Kristofer Kamiyasu | Sven Sundkvist | 1 |