| Series cast summary: |
 | Joss Ackland | - | Bernard Jeantet 1 episode, 1966 |
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 | Pamela Brown | - | Madame Pontreau 1 episode, 1966 |
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 | Jonathan Burn | - | Adil Bey 1 episode, 1966 |
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 | Frank Finlay | - | Dr. Hans Kuperus 1 episode, 1966 |
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 | Marius Goring | - | Monsieur Hire 1 episode, 1966 |
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 | Alexander Knox | - | Xavier Lhomond 1 episode, 1966 |
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 | Ronald Lewis | - | Honneville 1 episode, 1966 |
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 | Zia Mohyeddin | - | Elie Nagear 1 episode, 1966 |
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 | Stephen Murray | - | Jean-Paul Guillaume 1 episode, 1966 |
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| Kenneth J. Warren | - | Babib 1 episode, 1966 |
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 | Hywel Bennett | - | Gilles Mauvaisin 1 episode, 1966 |
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 | Keith Buckley | - | Louis Bert 1 episode, 1966 |
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 | Helen Cherry | - | Madame Guillaume 1 episode, 1966 |
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 | Michele Dotrice | - | Sonia 1 episode, 1966 |
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| Henry Gilbert | - | Inspector Gordes 1 episode, 1966 |
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 | Michael Goodliffe | - | Franz van Malderen 1 episode, 1966 |
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| Daphne Heard | - | Madame Naquet 1 episode, 1966 |
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| Mary Miller | - | Alice 1 episode, 1966 |
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| John Ronane | - | Dieudonne Lambert 1 episode, 1966 |
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| Gwendolyn Watts | - | Sylvie Baron 1 episode, 1966 |
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 | Sylvia Coleridge | - | Constance Ropiquet 1 episode, 1966 |
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 | Annette Crosbie | - | Nell 1 episode, 1966 |
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 | Patricia Healey | - | Jeane Jeantet 1 episode, 1966 |
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 | Peter Howell | - | Dr. Chouard 1 episode, 1966 |
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| Noel Johnson | - | Supt. Godot 1 episode, 1966 |
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 | Gemma Jones | - | Antoinette Baron 1 episode, 1966 |
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 | Moultrie Kelsall | - | Old Nalliers 1 episode, 1966 |
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 | Cyril Shaps | - | Headmaster 1 episode, 1966 |
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| Anthony Shirvell | - | Gaston 1 episode, 1966 |
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 | Jeanette Sterke | - | Nelia 1 episode, 1966 |
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| Betty Baskcomb | - | Madame Baron 1 episode, 1966 |
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 | Lyndon Brook | - | Police Superintendent 1 episode, 1966 |
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| Sheila Burrell | - | Madame Lhomond 1 episode, 1966 |
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| Madeleine Christie | - | Gérardine Eloi 1 episode, 1966 |
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 | Tenniel Evans | - | Judge 1 episode, 1966 |
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 | David Garfield | - | Insp. Favier 1 episode, 1966 |
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 | Barry Jackson | - | Jean Nalliers 1 episode, 1966 |
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 | Vera Lennox | - | Concierge 1 episode, 1966 |
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 | Nancy Nevinson | - | Madame Pendelli 1 episode, 1966 |
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| Paul Bacon | - | Pendelli 1 episode, 1966 |
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| Cyril Cross | - | Van der Cruyssen 1 episode, 1966 |
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 | Peter Halliday | - | Gaston 1 episode, 1966 |
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| Viola Keats | - | Madame Bert 1 episode, 1966 |
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| Sylvester Morand | - | Labourer 1 episode, 1966 |
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| Maitland Moss | - | Old Man 1 episode, 1966 |
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 | Jeremy Spenser | - | Karl Vorberg 1 episode, 1966 |
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 | Richard Warner | - | Counsellor Frissart 1 episode, 1966 |
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| Joan Young | - | Jaja 1 episode, 1966 |
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 | Clive Cazes | - | Messenger 1 episode, 1966 |
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 | Aimée Delamain | - | Mademoiselle Couvert 1 episode, 1966 |
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| Sheila Grant | - | Hermine 1 episode, 1966 |
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| Denis Holmes | - | Schutter 1 episode, 1966 |
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 | Michael Lees | - | Bouteille 1 episode, 1966 |
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 | Michael Pennington | - | Youth 1 episode, 1966 |
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| Dorothy Robson | - | Madame Frissart 1 episode, 1966 |
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 | Jon Rollason | - | Emile 1 episode, 1966 |
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| Andre Van Gyseghem | - | Plantel 1 episode, 1966 |
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| Jocelyn Britton | - | Colette 1 episode, 1966 |
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| Mary Chester | - | Concierge 1 episode, 1966 |
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| John Gugolka | - | Pierre 1 episode, 1966 |
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| Robert Hollyman | - | Counsellor Dolanne 1 episode, 1966 |
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| Elizabeth Hughes | - | Gilberte 1 episode, 1966 |
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 | Jonathan Lynn | - | Moise 1 episode, 1966 |
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 | John Ringham | - | Koline 1 episode, 1966 |
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| Robert Sansom | - | Kees 1 episode, 1966 |
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| Mary Webster | - | Loulou Mazzone 1 episode, 1966 |
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 | John Barrard | - | Detective Mine 1 episode, 1966 |
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| James Bulloch | - | Train attendant 1 episode, 1966 |
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| Christopher Burgess | - | Sergeant 1 episode, 1966 |
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| Heather Canning | - | Nadia 1 episode, 1966 |
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 | Erik Chitty | - | Clerk of Court 1 episode, 1966 |
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 | John Forgeham | - | Victor 1 episode, 1966 |
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| Joan Heath | - | Madame Rinquet 1 episode, 1966 |
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| John Moore | - | Waiter 1 episode, 1966 |
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| Brian Spink | - | Police Sergeant 1 episode, 1966 |
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| Tony Arpino | - | Foreign Worker 1 episode, 1966 |
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 | Edward Burnham | - | Hervineau 1 episode, 1966 |
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| Nicolas Chagrin | - | Valesco 1 episode, 1966 |
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| Carla Challoner | - | Niuta 1 episode, 1966 |
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| Alex Farrell | - | Postman 1 episode, 1966 |
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| Peter Jesson | - | Policeman 1 episode, 1966 |
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| Michael Poole | - | Krugov 1 episode, 1966 |
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 | Keith Pyott | - | Maitre Jouve 1 episode, 1966 |
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| Jeffrey Segal | - | Durel 1 episode, 1966 |
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| Paul Bahadur | - | Massembre 1 episode, 1966 |
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| Roger Croucher | - | Superintendent Belet 1 episode, 1966 |
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 | Donald Eccles | - | Parpin 1 episode, 1966 |
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 | Christopher George | - | Domb 1 episode, 1966 |
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| Michael Hawkins | - | Dr. Sauvaget 1 episode, 1966 |
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| Harry Mitchell | - | Old man by canal 1 episode, 1966 |
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| Basil Moss | - | Farmer 1 episode, 1966 |
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| Donald Tandy | - | Official 1 episode, 1966 |
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| John Carlin | - | Sauvegrain 1 episode, 1966 |
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| Geoffrey Cheshire | - | Jean 1 episode, 1966 |
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| Thomas Gallagher | - | Baron 1 episode, 1966 |
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| Langton Jones | - | Bonnard 1 episode, 1966 |
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| Alan Lake | - | Robert Eloi 1 episode, 1966 |
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| Charles Maunsell | - | Old man in surgery 1 episode, 1966 |
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| Mary Quinn | - | Eugenie 1 episode, 1966 |
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| Terence Soall | - | Doctor 1 episode, 1966 |
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 | Rona Anderson | - | Germaine Stévenard 1 episode, 1966 |
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| Roger Foss | - | Albert, young man in bar 1 episode, 1966 |
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 | Richard Gregory | - | Hotel Clerk 1 episode, 1966 |
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| Andreas Malandrinos | - | First man 1 episode, 1966 |
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| Joan Mane | - | Shop Assistant 1 episode, 1966 |
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| Mercia Mansfield | - | Madame Sauvaget 1 episode, 1966 |
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 | Norman Mitchell | - | Loos 1 episode, 1966 |
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| Will Stampe | - | Louis 1 episode, 1966 |
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| Gladys Bacon | - | Barmaid 1 episode, 1966 |
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 | Trevor Baxter | - | Priest 1 episode, 1966 |
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| Stephanie Bidmead | - | Jane van Malderen 1 episode, 1966 |
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 | Madge Brindley | - | Woman 1 episode, 1966 |
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| Muguette De Braie | - | Chambermaid 1 episode, 1966 |
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| Bernadette Milnes | - | Jacqueline, girl in bar 1 episode, 1966 |
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| Wolfe Morris | - | Geline 1 episode, 1966 |
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 | Kevin Stoney | - | Rinquet 1 episode, 1966 |
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| Reginald Barratt | - | Magistrate 1 episode, 1966 |
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| Geoffrey Beevers | - | Second man 1 episode, 1966 |
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 | Charles Carson | - | Germain Moussu 1 episode, 1966 |
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| John Gill | - | Dr. Greef 1 episode, 1966 |
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| Simon Prebble | - | Joseph Pape 1 episode, 1966 |
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| Lionel Wheeler | - | Clerk of the Court 1 episode, 1966 |
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 | Neil Wilson | - | Tigny, a policeman 1 episode, 1966 |
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| Winifred Dennis | - | Madame Moussu 1 episode, 1966 |
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| Hugh Evans | - | Gendarme 1 episode, 1966 |
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| Rosamund Greenwood | - | Louise Bernet 1 episode, 1966 |
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| Donald McCollum | - | Old man 1 episode, 1966 |
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| Victor Brooks | - | Jacques Beaudoin 1 episode, 1966 |
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| Derek Martin | - | Gendarme 1 episode, 1966 |
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| Tina Ruta | - | Singer 1 episode, 1966 |
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| Mario Fiorentini | - | Accordionist 1 episode, 1966 |
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| David Joel | - | Barman 1 episode, 1966 |
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| Sandra Arabian | - | Katia 1 episode, 1966 |
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| John Brandon | - | John 1 episode, 1966 |
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| Ronald Swire | - | Hussein 1 episode, 1966 |
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| Lee Richardson | - | Jean-Paul 1 episode, 1966 |
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| Brian Wright | - | Young officer 1 episode, 1966 |
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 | John Savident | - | Dutchman 1 episode, 1966 |
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| Michael Lynch | - | Turkish shepherd 1 episode, 1966 |
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| Hilda Maria Demlova | - | Maid 1 episode, 1966 |
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| Ray Smith | - | Horace 1 episode, 1966 |
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| Richard Cornish | - | Sailor 1 episode, 1966 |
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| Beryl Baxter | - | Madame Fabien 1 episode, 1966 |
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| Elizabeth Bell | - | Helene 1 episode, 1966 |
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| Peter Bennett | - | Customer 1 episode, 1966 |
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 | Joby Blanshard | - | Hippolyte 1 episode, 1966 |
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| Kathleen Breck | - | Babette 1 episode, 1966 |
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| Michael Brennan | - | Pessart 1 episode, 1966 |
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| David Buck | - | Charles Canut 1 episode, 1966 |
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| John Caesar | - | Waiter 1 episode, 1966 |
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| Denis Carey | - | Chief of Police 1 episode, 1966 |
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| Ian Colin | - | Count d'Estier 1 episode, 1966 |
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| Marty Cruikshank | - | Corinne Malou 1 episode, 1966 |
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 | Alan Curtis | - | Paul Fabien 1 episode, 1966 |
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 | Terence de Marney | - | Février 1 episode, 1966 |
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 | Edward Dentith | - | Jacques de Lamotte 1 episode, 1966 |
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 | Clive Dunn | - | Monsieur Jaminet 1 episode, 1966 |
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| Jessica Dunning | - | Jeanne Papelier 1 episode, 1966 |
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| Hamilton Dyce | - | Maître LaRoche 1 episode, 1966 |
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 | Sandor Elès | - | Blinis 1 episode, 1966 |
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| Leslie Glazer | - | Mado's Husband 1 episode, 1966 |
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| Stewart Guidotti | - | Pierre d'Estier 1 episode, 1966 |
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 | Frederick Jaeger | - | Vladimir 1 episode, 1966 |
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| Eric Jones | - | Hotel Clerk 1 episode, 1966 |
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 | Lila Kaye | - | Madame Poignard 1 episode, 1966 |
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 | Lila Kedrova | - | Emma Martens 1 episode, 1966 |
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| Barbara Keogh | - | Madame Jaminet 1 episode, 1966 |
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| Renny Lister | - | Britt 1 episode, 1966 |
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| Kevin Manser | - | Auctioneer 1 episode, 1966 |
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| Petra Markham | - | Hélène 1 episode, 1966 |
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| Nan Marriott-Watson | - | Madame Canut 1 episode, 1966 |
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| Paul A. Martin | - | Antoine 1 episode, 1966 |
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| Jon Mattocks | - | Barman 1 episode, 1966 |
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| Joan Miller | - | Madame Malou 1 episode, 1966 |
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| Phyllis Montefiore | - | Mado 1 episode, 1966 |
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 | Priscilla Morgan | - | Mlle. Germaine 1 episode, 1966 |
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| Gregory Paul | - | Boy 1 episode, 1966 |
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| Hazel Penwarden | - | Nurse Blanche 1 episode, 1966 |
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| David Phethean | - | Doctor Digoin 1 episode, 1966 |
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| Michael Reubens | - | Vial 1 episode, 1966 |
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 | Michael Robbins | - | Desire 1 episode, 1966 |
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 | George Roderick | - | Jules 1 episode, 1966 |
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| Jenny Russell | - | Lili 1 episode, 1966 |
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| Robin Scott | - | Gendarme 1 episode, 1966 |
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| Charles Thomas | - | Paumelle 1 episode, 1966 |
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| John Tillinger | - | Edgar Malou 1 episode, 1966 |
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 | Simon Ward | - | Alain Malou 1 episode, 1966 |
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| Russell Waters | - | Inspector Gonnet 1 episode, 1966 |
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 | Jerold Wells | - | Chief Supt. Gentil 1 episode, 1966 |
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 | Frank Williams | - | Maître Abeille 1 episode, 1966 |
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| Jack Woolgar | - | Joseph Bourgues 1 episode, 1966 |
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