- Phil Brown - Adam Markos
- Angus Lennie - Prof. Grodny
- Mark Jones - Scudder
- Olaf Pooley - Commissioner Braun
- Stephen Greif - Policeman - at Cafe
- Dinsdale Landen - Manning
- Peter Jeffrey - Police Inspector
- Sally James - Gordon's Secretary
- Gretchen Franklin - Nelly Baxter
- Stuart Wilson - Smith
- Georgina Hale - The Girl
- Milton Johns - Conway
- Patrick Mower - Raphael Santana
- George Pravda - Sneider
- Christopher Neame - Glen Bailey
- Joss Ackland - Arthur Gordon
- Eartha Kitt - Carrie Blaine
- Tom Bell - Shadbolt
- Donald Hewlett - Chambers
- Cyril Luckham - Alec Weston
- Maurice O'Connell - Slater
- Richard Hurndall - Judge Cronin
- Bernard Kay - Philip Bentley
- Neville Barber - Attendant
- Iain Cuthbertson - Wyatt
- Margaret John - Nurse
- Kate O'Mara - Sara Trent
- Clinton Greyn - David Cameron
- Kieron Moore - Mario Toza
- Harvey Hall - Freddie Reiwald
- Nicholas Jones - Ransome
- Paul Stassino - Captain Carozza
- John Scott - Civil Servant
- Judy Parfitt - Lena Haydon
- Roger Lloyd Pack - Russi
- Judy Bloom - Maria Russi
- John Thaw - Mario Carpiano
- Miki Iveria - Helene Morleiter
- Frederick Peisley - Paolo Morleiter
- Terence Plummer - Gunman
- Leo Dolan - Barman
- Lisa Daniely - Marquesa Visconti
- Mischa De La Motte - Dr. Blanco
- Hugh Morton - Bishop
- Jack Lynn - Professor Williams
- Gladys Spencer - Principessa Lilli
- Ben Howard - Vincenzo
- Gino Melvazzi - Police Captain
- Peter Vaughan - Quin
- Brian Glover - Allen
- Henry Woolf - Paco
- Anthony Langdon - Garcia
- Tristan Rogers - Maxwell
- Jacqueline Stanbury - Susan
- Jacqueline Stanbury - Car Hire Receptionist
- Luis Barboo - Taxi Driver
- Debbie Russ - Vicky Standish
- Derek Anders - Manning
- Norman Ettlinger - Sir Charles Standish
- John Normington - Brian Dukes
- Cicely Paget-Bowman - Headmistress
- Shane Shelton - Kruger
- Gerry Crampton - Barnes
- Hildegard Neil - Irena Gayevska
- William Lucas - Eastbrook
- Yuri Borienko - Zhukov
- Dennis Clinton - British Delegate
- Angela Douglas - Linda
- Ralph Bates - David Lee
- John Kane - Ludo Jones
- Basil Dignam - Charles Engleton
- Carmel McSharry - Cleaning Lady
- Frederick Jaeger - Bergen
- Yvonne Antrobus - Kate Bergen
- Paula Patterson - Miss. Hansen
- John Barron - Insurance Executive
- Andy Bradford - Motorcyclist
- Peter Porteous - Gang Member
- Martin Grace - Gang Member
- Robert Russell - Gang Member
- Peter Firth - Stephen Douglas
- Aldo Sambrell - Jacques
- Ruth Trouncer - Mrs. Douglas
- Neil Hallett - Dr. Dove
- Carl Forgione - Waiter
- Oskar Homolka - Zoltan Kolas
- Jon Laurimore - Reporter
- David Allister - Customs Official
- Gabor Vernon - Border Guard
- Sinéad Cusack - Anne Ferris
- Ken Hutchison - Mark Jenner
- Anthony Steel - Adam Ferris
- Madge Ryan - Mrs. Apsimon
- Prentis Hancock - William Arthur Mackay
- Prentis Hancock - William Arthur MacKay
- Rudolf Barry - Attendant
- Jill Townsend - Monica Davies
- Michael Sheard - Inspector Luhrs
- John Herrington - Official
- Donald Houston - Lockier
- William Dexter - Nickolai
- Kenneth Colley - Devlin
- Bruce Robinson - Peter Lockier
- Mary Larkin - Jenny
- Jack Galloway - Jasper
- Gary Hamilton - Mike
- Richard Marner - Russian
- Norman Atkyns - Stage Door Keeper
- Ronald Radd - Jerry Butler
- Mark Damon - Nick Archer
- Stephen Sheppard - Conyapepi
- Bruce Montague - Police Captain
- Pierre Bedenes - Hotel Porter
- George Little - Desk Clerk
- George von Moos - Airline Steward
- Erika Bergmann - Girlfriend
- Paul Curran - Kasankas
- Ray Lonnen - Patrick
- Donald Webster - George
- Graham Weston - Max
- James Ottaway - Bradley
- Gwen Cherrell - Anne Gordon
- Peter Cellier - Jones
- Peter Cellier - Auctioneer
- John Ringham - Prosecuting Counsel
- Paul Kelly - John Gordon
- Fred McNaughton - Gardener
- Graham Ashley - Police Inspector
- Michael Coles - Sandom
- Jeremy Wilkin - Insp. Lars Bergen
- Virginia Wetherell - Nurse
- Christopher Masters - Doctor
- Carl Bohen - Revell
- Dan Meaden - Lendrop
- Terry Richards - Detective
- Norman Beaton - Chauffeur
- Andrew Burleigh - Bellboy
- Stanley Meadows - Birch
- Eric Dodson - Doyle
- Raymond Skipp - Barney
- Ron Pember - Workman
- Paul Antrim - Policeman
- Robert Coleby - Anton
- John Law - Theatre Doctor
- Michael Lees - Consultant
- Jon Croft - Reporter
- Douglas Wilmer - Commander Whiting
- Derek Godfrey - David Barsella
- Derek Newark - Reece
- Drewe Henley - Clarke
- Max Faulkner - Jarman
- Doug Fisher - Tom Watt
- Tim Pearce - Editor
- David Suchet - Detective
- David Suchet - Leo
- Alf Joint - Taxi Driver
- Patrick Troughton - Bela Karoleon
- Vladek Sheybal - Sandor Karoleon
- Jill Balcon - Maria Karoleon
- John Cazabon - Heller
- Robert Brown - Governor
- Leon Lissek - Pannides
- Georgia Brown - Ilona Tabori
- Georgia Brown - Maria Ghardala
- James Bolam - Max Toller
- Al Mancini - Waiter
- George Innes - Marcus
- George Innes - Luigi
- Leonard Sachs - Senator
- Phillip Hinton - Mario
- Alan Webb - Blind Man
- Tony Haygarth - Driver
- David Bauer - Carl Huron
- Christopher Malcolm - Malloy
- Don Henderson - Walters
- David Calderisi - Garage Mechanic
- Roy Evans - Joe Lomax
- Stanley Lebor - President Medina
- Toby Robins - Madame Rue
- Charles Thake - Police Inspector
- Bob Sessions - Skipper
- Jenny Lee Wright - Julie
- Ron Randell - Jim Palmer
- Paul Weston - Lintar
- Diane Mercer - Maria
- Morris Perry - Hans Keller
- Shane Rimmer - Zeke
- Shane Rimmer - Vickers
- Mark Malicz - Osuna
- Anna Matisse - Helga Gratz
- Angela Grant - Monica
- Christopher Benjamin - Banker
- Kenneth Hendel - Spanish Official
- Anton Rodgers - Alan Sutherland
- Ronald Lacey - Cribbs
- Brian Worth - Salesman
- Penny Sugg - Nurse
- Donald Burton - Doctor
- Ian Hendry - Insp. Wilson
- Keith Bell - Sgt. Peters
- James Culliford - Ginter
- Geoffrey Morris - Frank Dilling
- Janos Kurucz - KGB Man
- Nigel Green - Colonel Vasili Krassinkov
- Laurence Naismith - Prof. Alexander Schelpin
- Milos Kirek - Russian Delegate
- Barry Warren - Hotel receptionist
- Kubi Chaza - Jill
- Anna Palk - Kate Linderman
- Derren Nesbitt - Colin Foster
- Derren Nesbitt - Brad Huron
- Barry Stanton - George Soaper
- Paul Freeman - Mechanic
- Brian Jackson - Turf Accountant
- Lewis Jones - Health Clinic Proprietor
- Patrick O'Connell - Reagan
- Bill Stewart - Garage Attendant
- Angharad Rees - Linda
- Michael Da Costa - Cafe Owner
- Michael Da Costa - Hotel Man
- Michael Da Costa - Emil Markov
- John Neville - Charlie
- Peter Bowles - Gregor Kofax
- John Barrard - Gem Setter
- Del Henney - Detective
- Margaret Lee - Susan Crediton
- Henry McGee - Frank
- Frederick Treves - Sir Walter Crediton
- Richard Easton - Dr. Lawrence Savage
- Peter Arne - Mario Giocvetti
- Harry Hutchinson - Butler
- Kenneth Watson - Insp. Jack Newman
- Manning Redwood - Alan Mason
- Freddie Jones - Robard
- Norman Rodway - Colin Grant
- Kenneth Gilbert - Detective
- Izabella Telezynska - Ingrid
- Izabella Telezynska - Irena Gleskova
- Damien Thomas - Visitor
- Susan Travers - Girl Friend
- Barrie Houghton - Goran
- Patrick Allen - James Leroy Mallory
- Julie Crosthwaite - Mallory's Girl
- Maxwell Shaw - Baruna
- Cyril Shaps - Doctor
- Arthur Howell - Fencing Master
- Bob Anderson - Assassin
- Morag Hood - Suzanne
- Tony Bateman - Barman
- Carl Rigg - Howard's Henchman
- Derek Smith - Jason Howard
- Anthony Stamboulieh - Yanos
- Michael Gough - Shkoder
- Neil McCallum - Bennett
- John Joyce - Air Traffic Controller
- John Nettleton - Inspector Hill
- William Moore - Rifle Range Supervisor
- David Buck - John Azon
- Ian Hogg - Gregg
- Hannah Gordon - Laura Rule
- Roshan Seth - Persuer
- Marc Zuber - Kahan's Henchman
- John Gatrell - Butler
- Jeremy Brett - Kahan
- Martin Benson - President
- Saeed Jaffrey - President's Aide
- Desmond Jordan - Doctor
- Donald Eccles - Douglas Perston
- Patrick Magee - Gardner
- Keith Buckley - Kurt
- Tom Chadbon - Vent
- Gertan Klauber - Gromeld
- Grahame Mallard - Tracker
- Stephanie Beacham - Chrissie
- George Baker - George Dixon
- Judith Arthy - Monique
- Georges Lambert - Bayard
- Gordon Sterne - Barman
- Hugo de Vernier - Croupier
- Sherwood Price - Felix Costa
- Madeleine Hinde - Mary Laroche
- Peter Fontaine - Bartender
- Dervis Ward - Jonathan P. Hacket
- Vernon Dobtcheff - Joe Flynn
- David Glover - Doctor
- Frederick Bennett - Security Man
- John Collin - Slade
- George Roubicek - Policeman
- Ed Bishop - Colonel John Hunter
- Sally Bazely - Mrs. Hunter
- Yasuko Nagazumi - Suki
- Anthony Chinn - Chino
- Milo O’Shea - Prince Carpiano
- Jacques Sernas - Fabrizzio
- Jeffrey Segal - Extremist Officer
- Richard Morant - David Mitchell
- Michael Goodliffe - De Santos
- James Maxwell - Mitchell
- Diana Quick - Anna De Santos
- Christopher Mitchell - Juan
- David Mayberry - Carlos
- Stephan Chase - Christian
- Patricia Haines - Madame Anderson
- Lalla Ward - Eva Anderson
- Oliver Ford Davies - Hansen
- Paul Dawkins - Davidson
- Karl Gustav Ahlefeldt - Beck
- Paul Jones - Caspar Parton
- Geraldine Moffat - Maria Milworth
- Barry Keegan - Barney Mailer
- Arnold Diamond - Asher Biebermann
- Paul McDowell - Bank Teller
- Malcolm Hayes - Intruder
- Harry Fielder - Transit Driver (uncredited)
- Reg Hill
Peter Vaughan interpreta a Quin en la serie.
Vernon Dobtcheff interpreta a Joe Flynn en la serie.
Paul Freeman interpreta a Mechanic en la serie.
Ronald Lacey interpreta a Cribbs en la serie.
Roshan Seth interpreta a Persuer en la serie.
Michael Gough interpreta a Shkoder en la serie.
Patrick Magee interpreta a Gardner en la serie.
Robert Vaughn interpreta a Harry Rule en la serie.
Tony Anholt interpreta a Paul Buchet en la serie.
Nyree Dawn Porter interpreta a Contessa Caroline de Conti en la serie.
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