- John Fraser - Dixon Druce
- Frances White - Lady Irene
- Frank Williams - Mr. Roberts
- David Battley - Podgers
- Alan Tilvern - Mr. Cornelius
- Leslie Dwyer - Lost Property Man
- Ray Smith - Chief prison officer
- Peter Birrel - M. Helder
- Barbara Murray - Lady Wiltshire
- Ingrid Hafner - Maria Hamer
- Derek Jacobi - William Drew
- John Stratton - Mallows
- James Bolam - Roberts
- Geoffrey Whitehead - Harry Parsket
- James Cossins - Dr. Jervis
- Patrick O'Connell - The Captain
- Moira Redmond - Mrs. Kavanagh
- Patrick Barr - Mr. Arundel
- Michael Bates - Colonel Sandstream
- Charles Gray - Eugene Valmont
- Kenneth Colley - Farrish
- Una Stubbs - Katie Harris
- George Murcell - Inspector Vandeleur
- Steve Hodson - Abel
- Donald Pleasence - Carnacki
- Timothy Bateson - Goujon
- Clifford Rose - Ransome
- Bernard Hepton - Mr. J.T. Laxworthy
- John Savident - Sir Arthur Inglewood
- Toke Townley - Lost Property Assistant
- Terence Rigby - Det. Sgt. Bates
- Derek Francis - Dixon
- Peter Cellier - Lord Wiltshire
- Robert Stephens - Max Carrados
- Lloyd Lamble - Inspector Brent
- Catherine Lacey - Mrs Steinberg
- Roger Delgado - Silva
- Jerold Wells - Phelps
- Jo Rowbottom - Suzie Shepherd
- Aideen O'Kelly - Bridie Sullavan
- Douglas Wilmer - Prof. Van Dusen
- Julian Glover - Alfred Barton
- George A. Cooper - Inspector Beedel
- Jeremy Irons - Nephew
- Jacqueline Pearce - Jenny Pryde
- Tom McCarthy - Frank Errington
- Jane Lapotaire - Emily Shaw
- Ray Lonnen - Sam Turner
- Dino Shafeek - Ali
- Cheryl Hall - Millie
- Terence Bayler - The Duke
- Arthur White - March
- John Carlisle - Stedman
- Bruce Boa - Freeling Poignton
- John Thaw - Lt. Holst
- Peter Bowles - Inspector Saunders
- Ronald Hines - Jonathan Pryde
- Paul Darrow - Dr. Hart
- Christopher Cazenove - Stringer
- Esmond Knight - Captain Cutler
- Arnold Diamond - Solomons
- Paul Angelis - Gillet
- Anthony Higgins - William Hazeldene
- Richard Hurndall - Lord Faber
- Michael Gough - Governor
- Roy Dotrice - Simon Carne
- Michele Dotrice - Mary Hisgins
- Peter Barkworth - Martin Hewitt
- Mel Churcher - Annie
- Richard Morant - Charlie Lomas
- Nicholas Courtney - Hutchinson Hatch
- Graham Seed - Porter
- Tony Steedman - Captain Hisgins
- George Moon - Cabbie
- David King - Gillow
- John Neville - Dr. Thorndyke
- Christopher Beeny - Sparks
- Richard Beckinsale - Richard Frobisher
- Paul Eddington - Hamer
- Lally Bowers - Lady Faber
- Gary Watson - Marquis Lefant
- Martin Jarvis - Philip Marsden
- Windsor Davies - Insp. Illingworth
- Cyril Shaps - Hunter
- Sheila Gish - Mrs. Chalmers
- John Standing - Lord Amberley
- John Levene - Constable
- Nicholas Smith - Solicitor
- Michael Elwyn - Greatorex
- Donald Pickering - Fielding
- Judy Geeson - Polly Burton
- Peter Vaughan - Dorrington
- Oscar Quitak - Leon Bouvier
- Christopher Neame - Sydney Wing
- John Quarmby - Court Attendant
- Robert Lang - Bernard Sutton
- Christopher Timothy - Solicitor
- Bernard Archard - Dr. Davidson
- Tony Caunter - Fielder
- Cyd Hayman - Laura Stanley
- Cyd Hayman - Miss Chapman
- Anthony Sharp - Mr. Lister
- Marcia Warren - Annette
- John Bryans - Prosecuting Counsel
- John Warner - Mr. Piercy
- Michael Sheard - Dr. Jones
- Morris Perry - Coroner
- Eve Pearce - Mrs. Goldstein
- Jean Marlow - May O'Brien
- Stanley Lebor - Paul Petrofsky
- Frank Mills - Polton
- Valerie Bell - Kate Wilfer
- Joanna Cooper - Edith Johnson
- John Wentworth - Thaxted
- Patrick McAlinney - Murphy
- Leslie French - Parkinson
- Susan Tebbs - Arabella
- Anthony Dawes - Defence Counsel
- Neil Wilson - Water Company Inspector
- Gregory Phillips - Water Company Assistant
- Hugh Morton - Judge
- Richard McNeff - Cab Driver
- Jon Croft - PC Huntley
- Gordon Russell - Newsboy
- Petronella Barker - Miss Parrot
- Robin Ford - Barratt
- Hilary Hardiman - Lady Jameson
- Patti Dalton - Post Office Clerk
- Felicity Gibson - Lady Amberley
- Dudley Foster - Chief Supt. Vyvyan
- Jaron Yaltan - Mujib
- Joan Scott - Mrs. McVitie
- John Rapley - Bouchet
- John Gill - Dewhurst
- Rafiq Anwar - Asif
- Neil McCarthy - Anderson
- Bill Bailey - Drunk
- Nadim Sawalha - Arab Servant
- Jasmina Hilton - Beatrice Selby
- Michael Johnson - Charles Beaumont
- Aimée Delamain - Miss Hisgins
- Nancy Nevinson - Madame Bouvier
- Michael Forrest - Jacques Bouvier
- Michael Nightingale - Harkness
- Alison Hughes - Maid
- Marianne Benet - Madame Sara
- Caroline John - Edith Dallas
- Moris Farhi - Dr. Sanchez
- Brenda Cowling - Maid
- Michael Poole - Ivanov
- Raf De La Torre - Prince Oblonsky
- Bill Wallis - Winfield
- Paul Williamson - Capt. Harris R.N.
- Paul Whitsun-Jones - Fat man
- Paul Whitsun-Jones - Marquis of Orpington
- John Nettleton - Belton
- John Nettleton - Admiral Christador
- Madeleine Mills - Maggie
- Jonathan Collins - William
- Elvi Hale - Lady Molly
- Ann Beach - Mary Grandard
- Elizabeth Weaver - Elizabeth Löwenthal
- Margot Boyd - Frau Mathis
- Tricia Thorns - Sally Anne
- Rosalind Lloyd - Lucy
- Dan Meaden - Insp. Nettings
- Stefan Kalipha - Rameau
- Hamilton Dyce - Styles
- Colin Rix - Yorky
- Andrea Lawrence - Vera
- Donald Sinden - Romney Pringle
- Alethea Charlton - Doris Pratt
- Victor Platt - Sergeant Hawkins
- John Evitts - Photographer
- Betty Cardno - Dresser
- Ron Pember - Jaffee
- Michael Cashman - Henry Stevens
- Michael Cashman - Asst. Purser Robbins
- Leon Collins - Constable Bellows
- John Owens - Curate
- Maggie Wells - Ethel
- Joan Henley - Mrs. Wycherly
- Arthur Pentelow - Inspector Plummer
- Tim Hardy - Sam Gunter
- James Ottaway - Parsloe
- James Cairncross - Briggs
- James Cairncross - Coroner
- Michael Lynch - Mr. Merston
- John Kidd - Estate Agent
- Malcolm McFee - Travel Clerk
- Roger Gartland - Charles Laker
- Brian Godfrey - Peach
- Wally Thomas - Bank Porter
- Peter Sugden - Fake Bank Porter
- Frank Wylie - Prosecuting Counsel
- Charles Lloyd Pack - Judge
- Charles Lloyd Pack - Mr. Neal
- Lois Baxter - Beatrice Hazeldene
- Barry Ashton - Buller's Bank Clerk
- Barry Ashton - Club Head Waiter
- Simon Lack - Andrew Campbell
- Dennis Blanch - Constable Thornton
- George Tovey - Porter
- Michael Rose - Station Master
- Julian D'Albie - Judge
- Edward Dentith - Supt. Miller
- Edward Dentith - Sir Edward Markham
- Reg Lye - Mortuary Superintendent
- Barry Keegan - Inspector Lipinzki
- Geoffrey Morris - De Beers Director
- Brian Cobby - De Beers Director
- Michael Redfern - Mac
- Robert Hartley - Perroquet
- Robert Hartley - Doctor
- John Gatrell - Jeweller
- John Gatrell - Major-General
- Michael Meacham - Ballard
- Derek Ware - Escaping prisoner
- Davyd Harries - Officer
- John Dawson - Inspector Fullalove
- John Dawson - Jacobs
- Richard Eden - Officer
- Mitzi Rogers - Madame Bertrand
- Clifford Parrish - Finch
- Clifford Parrish - Dr. Ewing
- Joan Heath - Mrs. Farrow
- Derek Smith - Prof. Popplebaum
- Derek Smith - Henry Jacobs
- Larry Cross - Foster
- Suzanne Neve - Miss. Mackail
- Barry Linehan - Insp. Hale
- George Howe - Lord Semptam
- Dennis Clinton - Summertrees
- Roger Bizley - Gauntlet
- Maurice Quick - Magistrate
- Maurice Quick - Usher
- Ronnie Masterson - Housekeeper
- Robert Webber - Commissioner of Oaths
- Robert Webber - Clergyman
- Derek Tansley - Colonel
- Michael Goldie - Fred
- Thick Wilson - Joe
- Anthony Allen - Rogers
- Stella Courtney - Shop assistant
- Keith Dalton - Newsboy
- Virginia Stride - Ulla Holst
- Catherine Schell - Maria Wolkinski
- Philip Madoc - Dimitri Wolkinski
- Anthony Newlands - Vorodov
- Vernon Dobtcheff - Molbech
- Michael Turner - Inspector Andersen
- Michael Beint - Police sergeant
- Peter Whitbread - Hotel Receptionist
- Ian Stirling - Policeman
- Julian Fox - Nicolai Wolkonski
- Tony Sibbald - Russian police captain
- Susanna East - Girl
- William Mervyn - Sir Hector Drummond
- Veronica Strong - Miss. Rossmore / Mrs. Morey
- Laurence Payne - Prescott
- Charles Morgan - Mallory
- Mark Eden - Roderick Varley
- Wallas Eaton - Sterling
- Dennis Chinnery - Morey
- William Moore - Station Sergeant
- Margaret John - Receptionist
- Michael Guest - Police constable
- Joe Dunlop - Wilkins
- Joe Dunlop - PC Oates
- Ronald Lewis - Dagobert Trostler
- Nicola Pagett - Countess Nadja
- Carolyn Jones - Countess Tildi Leys
- Michael Aldridge - Archduke Othmar
- Francis de Wolff - Walter Frankenburg
- Harold Kasket - Dr. Heinrich Weinlich
- Bill Horsley - Herr Wiegand
- Dennis Thorne - Berthold
- Brian Protheroe - Deubner
- Alan Cullen - British Ambassador
- Geoffrey Colville - Lenke
- Michael Mulcaster - Count Czernik
- Barrie Ingham - Dr. John Thorndyke
- Peter Sallis - Dr. Jervis
- Nicholas Selby - Superintendent Miller
- George Innes - Adolph Schonberg
- Max Faulkner - Mounted Policeman
- Michael Harding - Ticket collector
- Richard Pearson - Marquess of Macclesfield
- Ralph Truman - Foreign Secretary
- Lisa Harrow - Beatrice Graham
- Simon Gough - Jack Bellingham
- Denise Coffey - Miss Baines
- Sara Clee - Gerda Krempelstein
- Peter Arne - Colonel Davidoff
- Richard Warner - Count Krempelstein
- Peter Eyre - George Fitzwilliam
- Henri Szeps - Laval
- David Webb - Musgrove
- David Tate - Sgt. Tapling
- Nina West - Maid
- Ronald Fraser - Horrocks
- Paul Hardwick - Lord Altington
- Jean Marsh - Mrs. Vanrenen
- Norman Bird - Inspector Trent
- Stephen Yardley - First Officer Clayton
- Douglas Blackwell - Taylor
- John Barcroft - Gaylord
- John Tordoff - Fox
- Lindsay Campbell - Captain Handmay
- Annette Kerr - Mrs. Pallin
- John Sterland - Shipping Clerk
- Melanie Jane - Mrs. Clayton
- Sara Kestelman - Hagar
- Joss Ackland - Grubber
- Stephan Chase - Freddy
- Philip Locke - Vark
- Sarah Craze - Rose
- Rosemary Lord - Kitty
- Kathleen Byron - Miss Lyle
- Doris Rogers - Mrs. Arryford
- Jonathan Adams - Sgt. Finch
- Frederick Radley - Charlie
- Robin Ellis - Charles Dallas
- John Phillips - Professor Dyne
- John Barron - Sir Revel Revell, Q.C.
- Jack May - James Ladbroke, Q.C.
- Celia Bannerman - Milly Revell
- Margot Thomas - Lady Revell
- Gordon Gostelow - Inspector Mayhew
- Clifford Cox - Police Sergeant
- Howard Goorney - George Wilson
- John Crocker - Vincent Coyle
- Michael Stainton - Brander
- Jay Neill - Matthew
- Jack Galloway - Reporter
- Mark Rogers - Newsboy
- Antony Viccars - Cabby
- Ken Barker - Clerk of the Court
Vernon Dobtcheff interpreta a Molbech en la serie.
John Fraser interpreta a Dixon Druce en la serie.
Frances White interpreta a Lady Irene en la serie.
Frank Williams interpreta a Mr. Roberts en la serie.
David Battley interpreta a Podgers en la serie.
Alan Tilvern interpreta a Mr. Cornelius en la serie.
Leslie Dwyer hace el papel de Lost Property Man.
Ray Smith interpreta a Chief prison officer en la serie.
Peter Birrel interpreta a M. Helder en la serie.
Barbara Murray hace el papel de Lady Wiltshire.
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