 | Geoffrey Keen | ... | Brian Stead (128 episodes, 1965-1972) |
 | Philip Latham | ... | Willy Izard (108 episodes, 1965-1972) |

| Ray Barrett | ... | Peter Thornton (106 episodes, 1965-1972) |

| Robert Hardy | ... | Alec Stewart (49 episodes, 1966-1970) |
 | Deborah Stanford | ... | Roz Stewart (30 episodes, 1966-1970) |
 | Philippa Gail | ... | Jane Webb / ... (19 episodes, 1965-1971) |
 | Isobel Black | ... | Eileen O'Rourke (16 episodes, 1967-1968) |
 | John Carson | ... | James Langley / ... (15 episodes, 1966-1972) |
 | Jayne Sofiano | ... | Dr. Ginny Vickers / ... (14 episodes, 1967-1969) |
 | Barry Foster | ... | Robert Driscoll (10 episodes, 1965) |
 | Edward de Souza | ... | Charles Grandmercy (10 episodes, 1967-1968) |
 | Virginia Wetherell | ... | Julie Serres (9 episodes, 1967) |
 | Margaret Ward | ... | Joan Izard / ... (8 episodes, 1965-1971) |
 | Arthur Pentelow | ... | Managing Director / ... (7 episodes, 1965-1970) |
 | Bruce Boa | ... | Bill Douglas / ... (7 episodes, 1965-1969) |
 | Ronald Hines | ... | Derek Prentice (7 episodes, 1965) |
 | Beryl Cooke | ... | Miss Jenkins (7 episodes, 1970-1971) |
 | Justine Lord | ... | Steve Thornton (6 episodes, 1965-1968) |

| Jack Gwillim | ... | Sir Charles Bliss / ... (6 episodes, 1967-1969) |
 | Jennifer Clulow | ... | Miss Clarkson (6 episodes, 1967-1968) |
 | Camilla Brockman | ... | Claire Cooke (6 episodes, 1967) |

| Joss Ackland | ... | Sam Jardine / ... (5 episodes, 1966-1968) |
 | Geoffrey Chater | ... | Deputy Chairman / ... (5 episodes, 1966-1967) |
 | Dora Reisser | ... | Ghislaine Foss (5 episodes, 1969) |

| Jennifer Wright | ... | Mrs. George (5 episodes, 1970) |
 | Anna Matisse | ... | Britte Langley (5 episodes, 1971) |
 | Bari Jonson | ... | Abdul Khamsin / ... (4 episodes, 1965-1968) |
 | Robert Pitt | ... | Driller / ... (4 episodes, 1965-1967) |
 | Anthony Chinn | ... | Colonel Kai Twan / ... (4 episodes, 1966-1970) |
 | Olive McFarland | ... | Nina Kapler (4 episodes, 1966-1970) |
 | Walter Sparrow | ... | Captain / ... (4 episodes, 1966-1970) |
 | Derek Sydney | ... | Doctor / ... (4 episodes, 1966-1969) |
 | Alan Gifford | ... | Harriman / ... (4 episodes, 1966-1968) |

| Wanda Ventham | ... | Moira Hart (4 episodes, 1967-1971) |
 | Christopher Carlos | ... | Minister / ... (4 episodes, 1967-1970) |
 | David Baron | ... | Mike Szabo (4 episodes, 1967) |
 | Larry Cross | ... | Angus Ross / ... (4 episodes, 1968-1971) |
 | Pamela Saire | ... | Secretary / ... (4 episodes, 1969-1971) |
 | Robert James | ... | Alastair McFee / ... (3 episodes, 1965-1971) |
 | James Beck | ... | Alan Boyd / ... (3 episodes, 1965-1970) |
 | Jack Watson | ... | Archie Turner / ... (3 episodes, 1965-1970) |
 | Jerry Stovin | ... | Eddie / ... (3 episodes, 1965-1969) |
 | Peter Madden | ... | Humphreys / ... (3 episodes, 1965-1968) |
 | George Roubicek | ... | Ed Wilson / ... (3 episodes, 1965-1968) |
 | George A. Cooper | ... | Eddy Schofield / ... (3 episodes, 1965-1967) |

| Nigel Stock | ... | Arthur Rogers / ... (3 episodes, 1965-1967) |
 | Wendy Gifford | ... | Hilary Dawson (3 episodes, 1965-1966) |
 | John Tate | ... | Milt Addis / ... (3 episodes, 1965-1966) |
 | Brian Oulton | ... | Darlton / ... (3 episodes, 1966-1971) |
 | Julian Sherrier | ... | Captain Hamed / ... (3 episodes, 1966-1971) |
 | Laurie Webb | ... | Attendant / ... (3 episodes, 1966-1970) |
 | David Healy | ... | Bob Stevens / ... (3 episodes, 1966-1969) |

| Burt Kwouk | ... | Tamira Hitaki / ... (3 episodes, 1966-1969) |
 | Salmaan Peerzada | ... | Ajibba / ... (3 episodes, 1966-1969) |
 | Roy Purcell | ... | Air Supervisor / ... (3 episodes, 1966-1969) |
 | David Bauer | ... | Andrea Szabo / ... (3 episodes, 1966-1968) |

| Tsai Chin | ... | Esther Ho / ... (3 episodes, 1966-1967) |
 | Ronald Rubin | ... | American voice / ... (3 episodes, 1966-1967) |
 | Windsor Davies | ... | Aneurin Griffith / ... (3 episodes, 1967-1971) |
 | Arnold Diamond | ... | Charles Masson / ... (3 episodes, 1967-1971) |

| Lucille Soong | ... | Hostess / ... (3 episodes, 1967-1970) |

| Saeed Jaffrey | ... | Anton Salgado / ... (3 episodes, 1967-1969) |
 | Donald Pickering | ... | Benson Taylor / ... (3 episodes, 1967-1969) |
 | Barbara Shelley | ... | Lita Perez / ... (3 episodes, 1968-1971) |
 | Jerold Wells | ... | Captain Thomas / ... (3 episodes, 1968-1971) |
 | Norman Florence | ... | Marghen / ... (3 episodes, 1968-1970) |
 | John Hussey | ... | Denning / ... (3 episodes, 1968-1970) |
 | Rex Robinson | ... | Alec / ... (3 episodes, 1968-1970) |
 | Hilary Heath | ... | Rolli Johnson (3 episodes, 1969-1970) |
 | Geoffrey Toone | ... | Sir Charles Bliss (3 episodes, 1971) |
 | Robert Rietty | ... | Giuseppe / ... (2 episodes, 1965-1970) |
 | Arthur Hewlett | ... | Bellinshaw / ... (2 episodes, 1965-1969) |

| Richard Marner | ... | Andrei Alexandrev / ... (2 episodes, 1965-1969) |

| Frank Williams | ... | Finch / ... (2 episodes, 1965-1969) |
 | Margery Withers | ... | Gran / ... (2 episodes, 1965-1969) |
 | Diana Ashley | ... | Car Hire Girl / ... (2 episodes, 1965-1968) |
 | Terence Lodge | ... | Salah / ... (2 episodes, 1965-1968) |
 | Barry Keegan | ... | Grant / ... (2 episodes, 1965-1967) |
 | Kenneth Kendall | ... | Newsreader (2 episodes, 1965-1967) |
 | Carmen Munroe | ... | Adaku / ... (2 episodes, 1965-1967) |
 | Cleo Sylvestre | ... | Gert / ... (2 episodes, 1965-1967) |
 | Eileen Way | ... | Mrs. Murtagh / ... (2 episodes, 1965-1967) |
 | Roger Avon | ... | Charge Hand / ... (2 episodes, 1965-1966) |
 | Richard Coe | ... | Computer Operator / ... (2 episodes, 1965-1966) |
 | John Downey | ... | Sam / ... (2 episodes, 1965-1966) |
 | Peter Halliday | ... | Hepburn / ... (2 episodes, 1965-1966) |
 | Alan Hockey | ... | Charlie Willis / ... (2 episodes, 1965-1966) |
 | Jane Hylton | ... | May MacCallum / ... (2 episodes, 1965-1966) |
 | Douglas Livingstone | ... | Bowers / ... (2 episodes, 1965-1966) |
 | Elizabeth Shepherd | ... | Frau Lenz / ... (2 episodes, 1965-1966) |
 | Ewen Solon | ... | General Stassney / ... (2 episodes, 1965-1966) |
 | Warren Stanhope | ... | Hotel Clerk / ... (2 episodes, 1965-1966) |

| William Sylvester | ... | Al Stevens / ... (2 episodes, 1965-1966) |
 | James Brandon | ... | George Reugen / ... (2 episodes, 1965) |
 | Aleta Morrison | ... | Miss Martin (2 episodes, 1965) |
 | Vincent Ball | ... | Captain Grainger / ... (2 episodes, 1966-1971) |
 | Philip Madoc | ... | Ignace Mattzini / ... (2 episodes, 1966-1971) |
 | Patricia English | ... | Denny Carson / ... (2 episodes, 1966-1970) |
 | Robert MacLeod | ... | Arthur Milne / ... (2 episodes, 1966-1970) |
 | Ronald Mayer | ... | Ministry Official / ... (2 episodes, 1966-1970) |
 | Frank Singuineau | ... | Jettaro / ... (2 episodes, 1966-1970) |
 | Rudolph Walker | ... | Gregory Almolo / ... (2 episodes, 1966-1970) |
 | George Webb | ... | Henri Vassiere / ... (2 episodes, 1966-1970) |
 | John Bown | ... | Air Controller / ... (2 episodes, 1966-1969) |

| Edwina Carroll | ... | Cathy Demarest / ... (2 episodes, 1966-1969) |
 | Denis Chin | ... | Chauffeur (2 episodes, 1966-1969) |

| Peter Copley | ... | Compton-Forbes / ... (2 episodes, 1966-1969) |
 | Bella Emberg | ... | Hilda / ... (2 episodes, 1966-1969) |
 | Hal Galili | ... | Art Bronovsky / ... (2 episodes, 1966-1969) |
 | Brian Hayes | ... | Coppard / ... (2 episodes, 1966-1969) |
 | Neil McCallum | ... | Jean Paul / ... (2 episodes, 1966-1969) |
 | George Murcell | ... | Al Nillson / ... (2 episodes, 1966-1969) |
 | Bryden Murdoch | ... | Andrew Garvie / ... (2 episodes, 1966-1969) |
 | Joseph O'Conor | ... | Captain Kenny / ... (2 episodes, 1966-1969) |
 | Jerry Ram | ... | Indian Worker / ... (2 episodes, 1966-1969) |

| Michael Sheard | ... | German / ... (2 episodes, 1966-1969) |
 | Veronica Strong | ... | Erica Taplow / ... (2 episodes, 1966-1969) |
 | Charles 'Bud' Tingwell | ... | Blue Hughes / ... (2 episodes, 1966-1969) |
 | Kevin Brennan | ... | James Lentin / ... (2 episodes, 1966-1968) |
 | Artro Morris | ... | Harry / ... (2 episodes, 1966-1968) |
 | John Stratton | ... | Dowding / ... (2 episodes, 1966-1968) |
 | Patrick Barr | ... | John Hallmaine / ... (2 episodes, 1966-1967) |
 | Ann Bell | ... | Ellen Jardine (2 episodes, 1966-1967) |
 | John Bloomfield | ... | Frank Marshall / ... (2 episodes, 1966-1967) |
 | Hamilton Dyce | ... | Arthur Masters / ... (2 episodes, 1966-1967) |
 | Michael Hawkins | ... | Arthur Frost / ... (2 episodes, 1966-1967) |
 | Nancie Jackson | ... | Jean Bagnall / ... (2 episodes, 1966-1967) |
 | Gertan Klauber | ... | Kulator / ... (2 episodes, 1966-1967) |
 | Eric Lander | ... | Gordon Faulkner / ... (2 episodes, 1966-1967) |
 | Dennis Alaba Peters | ... | Ambassador / ... (2 episodes, 1966-1967) |
 | Richard Steele | ... | English voice / ... (2 episodes, 1966-1967) |
 | Peter Zander | ... | Ali Nessim / ... (2 episodes, 1966-1967) |
 | Geoffrey Denton | ... | Sir Richard Costello / ... (2 episodes, 1966) |
 | Edward Rees | ... | Chairman of Tribunal / ... (2 episodes, 1966) |
 | Peter Jeffrey | ... | Heritage / ... (2 episodes, 1967-1971) |
 | John Barcroft | ... | Dudley Fitzgibbon / ... (2 episodes, 1967-1970) |
 | Tommy Eytle | ... | George Ansofi / ... (2 episodes, 1967-1970) |
 | Rio Fanning | ... | Bill Jackson / ... (2 episodes, 1967-1970) |
 | Shay Gorman | ... | Gabriel Benoit / ... (2 episodes, 1967-1970) |
 | Willie Jonah | ... | Guide / ... (2 episodes, 1967-1970) |
 | Arnold Peters | ... | Arthur Clark / ... (2 episodes, 1967-1970) |
 | Dermot Tuohy | ... | Charlie Woods / ... (2 episodes, 1967-1970) |
 | Stephanie Bidmead | ... | Chrissie Grieve / ... (2 episodes, 1967-1969) |
 | Frank Gatliff | ... | Heston / ... (2 episodes, 1967-1969) |
 | Sidney Johnson | ... | Doorman / ... (2 episodes, 1967-1969) |
 | Kristopher Kum | ... | Mang Hing Chung / ... (2 episodes, 1967-1969) |
 | Bill Nagy | ... | Douglas / ... (2 episodes, 1967-1969) |
 | Grant Taylor | ... | Al Viner / ... (2 episodes, 1967-1969) |
 | James Appleby | ... | Bourton / ... (2 episodes, 1967-1968) |
 | Bruno Barnabe | ... | Dr. Giuseppe Casale / ... (2 episodes, 1967-1968) |
 | James Bree | ... | Jack Lang / ... (2 episodes, 1967-1968) |
 | Rani Dubé | ... | Miss Kapur / ... (2 episodes, 1967-1968) |
 | Michael Godfrey | ... | Commandante Bekkat / ... (2 episodes, 1967-1968) |

| Fulton Mackay | ... | MacKenzie / ... (2 episodes, 1967-1968) |
 | Phil McCall | ... | Driver / ... (2 episodes, 1967-1968) |

| Geoffrey Palmer | ... | Jeremy Martin (2 episodes, 1967-1968) |
 | Maxwell Shaw | ... | Alfredo Ramerez / ... (2 episodes, 1967-1968) |
 | Corbet Woodall | ... | Newscaster / ... (2 episodes, 1967-1968) |
 | John Horsley | ... | Andrews / ... (2 episodes, 1967) |
 | Kurt Christian | ... | Marcel / ... (2 episodes, 1968-1971) |
 | Vera Fusek | ... | Genie Mattzini / ... (2 episodes, 1968-1971) |
 | Frederick Treves | ... | Hopkins / ... (2 episodes, 1968-1971) |
 | Thomas Baptiste | ... | Daniel / ... (2 episodes, 1968-1970) |
 | Yashaw Adem | ... | Major Atami / ... (2 episodes, 1968-1969) |
 | John Horton | ... | Johnny Sawchuk / ... (2 episodes, 1968-1969) |
 | Marne Maitland | ... | Da Silva / ... (2 episodes, 1968-1969) |
 | Roddy McMillan | ... | Angus Miller / ... (2 episodes, 1968-1969) |
 | Bloke Modisane | ... | Casey / ... (2 episodes, 1968-1969) |
 | John Ringham | ... | Arthur / ... (2 episodes, 1968-1969) |
 | Jack Le White | ... | Paris Agent / ... (2 episodes, 1968) |
 | Patrick Westwood | ... | Hassud / ... (2 episodes, 1968) |
 | Willy Bowman | ... | Businessman / ... (2 episodes, 1969-1971) |
 | Maurice Quick | ... | Head waiter / ... (2 episodes, 1969-1971) |
 | Hilary Tindall | ... | Dr. Neave / ... (2 episodes, 1969-1971) |
 | John A. Tinn | ... | Government Assistant / ... (2 episodes, 1969-1971) |
 | Richard Caldicot | ... | Governor / ... (2 episodes, 1969-1970) |
 | Linda Cole | ... | Ann Donaldson / ... (2 episodes, 1969-1970) |
 | Raf De La Torre | ... | Belanger / ... (2 episodes, 1969-1970) |
 | Hugo De Vernier | ... | Besada / ... (2 episodes, 1969-1970) |
 | Mark Heath | ... | Boatman / ... (2 episodes, 1969-1970) |
 | Clifton Jones | ... | Minister / ... (2 episodes, 1969-1970) |
 | John Lee | ... | Ronnie Darling / ... (2 episodes, 1969-1970) |
 | Linda Liles | ... | Ann Carlson / ... (2 episodes, 1969-1970) |
 | Ellario Pedro | ... | Drummer / ... (2 episodes, 1969-1970) |
 | Barry Savage | ... | Hendryk Van Veda / ... (2 episodes, 1969-1970) |
 | Kit Taylor | ... | Jimmy Tyler / ... (2 episodes, 1969-1970) |
 | Ron Welling | ... | Sparks / ... (2 episodes, 1969-1970) |
 | Nick Zaran | ... | Lucien / ... (2 episodes, 1969-1970) |
 | Bernard Hepton | ... | Mayne (2 episodes, 1969) |
 | Earl Jardine | ... | Guard / ... (2 episodes, 1969) |
 | Valerie Stanton | ... | Girl / ... (2 episodes, 1969) |
 | Richard Wyler | ... | Michael Stenman (2 episodes, 1969) |
 | Ken Wynne | ... | Henri Guillard (2 episodes, 1969) |
 | Edwin Brown | ... | Policeman / ... (2 episodes, 1970-1971) |
 | Roy Stewart | ... | Carlos / ... (2 episodes, 1970) |
 | Pamela Abbott | ... | Miss. Bateson (2 episodes, 1971) |
 | Frank Duncan | ... | Coltremaine / ... (2 episodes, 1971) |
 | Jay Neill | ... | Estrada / ... (2 episodes, 1971) |
 | Amelia Read | ... | Amelia Hart (2 episodes, 1971) |

| Catherine Schell | ... | Kirsten Hansen (2 episodes, 1971) |