| Name | Character | Episodes |
|---|---|---|
| Helen Hunt | Nancy Campbell | 13 |
| Lesley Manville | Robina Chase | 13 |
| Jonah Hauer-King | Harry Chase | 13 |
| Julia Brown | Lois Bennett | 13 |
| Brian J. Smith | Webster O'Connor | 13 |
| Tomasz Kot | Stefan Tomaszeski | 13 |
| Parker Sawyers | Albert Fallou | 13 |
| Mateusz Więcławek | Grzegorz Tomaszeski | 9 |
| Sean Bean | Douglas Bennett | 7 |
| Ewan Mitchell | Tom Bennett | 7 |
| Max Riemelt | Schmidt | 7 |
| Victoria Mayer | Claudia Rossler | 7 |
| Gregg Sulkin | David | 6 |
| Blake Harrison | Stan | 5 |
| Mark Bonnar | Sir James Danemere | 4 |
| Jonathan Harden | Briggs | 3 |
| Ewan Mitchell | Tom | 2 |
| Agata Kulesza | Maria Tomaszeski | 2 |
| Ceallach Spellman | Joe | 2 |
| Mark Bonnar | Sir James | 1 |
| Jonathan Harden | Captain Briggs | 1 |