| Name | Character | Episodes |
|---|---|---|
| Keeley Hawes | Priscilla Garrick | 6 |
| Michael Stuhlbarg | Rowe | 6 |
| David Hargreaves | Martin Garrick | 6 |
| Simon Kunz | Herbert Quick | 6 |
| Matt Lauria | Peter McCormick | 6 |
| Benjamin Walker | Jimmy Derby | 6 |
| Luke Treadaway | Hugh Fenton | 6 |
| Jamie Blackley | Freddie Symonds | 6 |
| Albert Welling | Brigadier Moss | 6 |
| Greg McHugh | David Hennessey | 6 |
| Emma Appleton | Feef Symonds | 6 |
| Brandon P Bell | Jackson Cole | 6 |
| Andrew Byron | Aide russe | 1 |