| Name | Character | Episodes |
|---|---|---|
| William Smith | Jimmy Delaney | 39 |
| Nigel Patrick | Alan Garnett | 39 |
| Katya Douglas | Maya | 39 |
| Joseph Fürst | 1 | |
| Muriel Pavlow | 1 | |
| George Baker | 1 | |
| George Coulouris | 1 | |
| Michael Goodliffe | 1 | |
| Jack MacGowran | 1 | |
| William Marlowe | 1 | |
| George Pastell | 1 | |
| Bill Shine | 1 | |
| Kieron Moore | 1 | |
| Andrew Faulds | 1 | |
| Patricia Neal | 1 | |
| Eric Pohlmann | 1 | |
| Brenda Bruce | 1 | |
| Roger Avon | 1 | |
| Richard Pasco | 1 | |
| John Turner | 1 | |
| Virginia Maskell | 1 | |
| Margaret Rutherford | 1 | |
| Richard Leech | 1 | |
| Harry Locke | 1 | |
| Robert Flemyng | 1 | |
| Michael Brennan | 1 | |
| Michael Ward | 1 | |
| Alex Scott | 1 | |
| Meredith Edwards | 1 | |
| Lionel Murton | 1 | |
| Beatrice Varley | 1 | |
| Lockwood West | 1 | |
| Patrick McAlinney | 1 |