 | John DeVaut | ... | Bird / ... (3 episodes, 1964-1969) |
 | Esmond Knight | ... | Albert / ... (3 episodes, 1964-1969) |
 | Ralph Michael | ... | Arthur Geraldine / ... (3 episodes, 1964-1969) |
 | Barbara Couper | ... | Miss Winkworth / ... (3 episodes, 1964-1968) |
 | Peter Copley | ... | Dr. John Evelyn Thorndyke / ... (2 episodes, 1964-1969) |
 | Sheila Dunn | ... | Maid / ... (2 episodes, 1964-1969) |
 | Hamilton Dyce | ... | Inspector Wright / ... (2 episodes, 1964-1969) |
 | Patricia English | ... | Isobel Vitrey / ... (2 episodes, 1964-1969) |
 | Kenneth Fortescue | ... | Charles Ford / ... (2 episodes, 1964-1969) |
 | Joseph Greig | ... | Gianella / ... (2 episodes, 1964-1969) |

| Aubrey Morris | ... | Alfred Knottage / ... (2 episodes, 1964-1969) |
 | Martin Wyldeck | ... | Sam Alford / ... (2 episodes, 1964-1969) |
 | Geoffrey Bayldon | ... | Kingston / ... (2 episodes, 1964-1968) |
 | Nan Braunton | ... | Florence Gill / ... (2 episodes, 1964-1968) |
 | James Bree | ... | Henry Oliver / ... (2 episodes, 1964-1968) |
 | Edwin Brown | ... | Detective sergeant / ... (2 episodes, 1964-1968) |
 | Donald Douglas | ... | Arthur Penfold / ... (2 episodes, 1964-1968) |
 | Frank Gatliff | ... | Al Kresnick / ... (2 episodes, 1964-1968) |
 | Penelope Horner | ... | Eve Gill / ... (2 episodes, 1964-1968) |
 | Richard Hurndall | ... | General Shrivenham / ... (2 episodes, 1964-1968) |
 | Frederick Jaeger | ... | Mischa Kuprin / ... (2 episodes, 1964-1968) |
 | Jennifer Jayne | ... | Clare Massinger / ... (2 episodes, 1964-1968) |
 | Allan McClelland | ... | George Wick / ... (2 episodes, 1964-1968) |
 | Brian Oulton | ... | Erwin Spode / ... (2 episodes, 1964-1968) |
 | Frederick Peisley | ... | Arch / ... (2 episodes, 1964-1968) |
 | Arthur Pentelow | ... | Inspector Moreby / ... (2 episodes, 1964-1968) |
 | Llewellyn Rees | ... | Dr. Abercrombie / ... (2 episodes, 1964-1968) |
 | Marian Spencer | ... | Lady Anstruther / ... (2 episodes, 1964-1968) |
 | Susanna Carroll | ... | Hat-check Girl / ... (2 episodes, 1964) |
 | Derek Francis | ... | Rosseter / ... (2 episodes, 1964) |
 | William Kendall | ... | John Raggley / ... (2 episodes, 1964) |
 | Ivor Salter | ... | C.I.D. Sergeant / ... (2 episodes, 1964) |
 | John Carson | ... | Alan Grant / ... (2 episodes, 1968-1969) |
 | Hilda Fenemore | ... | Mrs. Law / ... (2 episodes, 1968-1969) |
 | Arthur Hewlett | ... | Padre / ... (2 episodes, 1968-1969) |
 | Charles Hodgson | ... | Boosie / ... (2 episodes, 1968-1969) |
 | Robert James | ... | Chief Inspector Blount / ... (2 episodes, 1968-1969) |
 | Phil McCall | ... | Snatcher / ... (2 episodes, 1968-1969) |
 | Peter Miles | ... | Rev. Dudley Simmons / ... (2 episodes, 1968-1969) |
 | Lee Montague | ... | Police Chief Fellows (2 episodes, 1968-1969) |
 | Geraldine Newman | ... | Beatrice Lidwill / ... (2 episodes, 1968-1969) |
 | Geoffrey Rose | ... | Prefect / ... (2 episodes, 1968-1969) |
 | Kevin Stoney | ... | Colonel Johnson / ... (2 episodes, 1968-1969) |
 | John Stratton | ... | Cedric Malmsley / ... (2 episodes, 1968-1969) |
 | Robin Wentworth | ... | Doctor / ... (2 episodes, 1968-1969) |
 | Edward Woodward | ... | Auguste Duprin / ... (2 episodes, 1968-1969) |
 | Christopher Benjamin | ... | Ralph Demartino / ... (2 episodes, 1968) |
 | Bernard Hepton | ... | Dr. Hawley Crippen / ... (2 episodes, 1968) |

| Elizabeth Shepherd | ... | Jennifer Davis / ... (2 episodes, 1968) |