| Name | Character | Episodes |
|---|---|---|
| Michelle Dockery | Estella Williams | 6 |
| David Dawson | Robbie Carmen | 6 |
| Freya Parks | Fiona | 6 |
| Peter McDonald | Eamonn Quinn | 6 |
| Jordan Bolger | Gregory Williams | 6 |
| Eve Austin | Jeannie | 6 |
| Nicholas Pinnock | Deuce Williams | 6 |
| John Heffernan | Commander Bentley | 4 |
| George Somner | Tyro | 2 |
| Geraldine James | Marie | 1 |
| Paddy Rowan | Soldier | 1 |
| Anthony Howell | Horace Bird | 1 |
| John Tueart | Policeman | 1 |
| Roger Barclay | Lieutenant Colonel Harley | 1 |
| Simon Paisley Day | Jeff | 1 |