- Patricia Haines - Veronica Bray
- Caroline Blakiston - Kate Mortimer
- Richard Vernon - Colonel Loring
- Tommy Godfrey - Taxi Driver
- Peter Copley - The Auctioneer
- Barbara Murray - Tania Andre
- Stanley Lebor - Fraser
- Richard Heffer - Albert Hughes
- Brian Oulton - Doctor Davis
- Robert Urquhart - Anthony James Harvey / Andrew Heywood
- Al Mancini - Durres
- Sue Lloyd - Brigitte
- Alex Scott - Enzo Brandini
- Alan Wheatley - Carter
- Harold Kasket - Korlandt
- Clinton Greyn - Gerard
- Olivia Hamnett - Anita
- Eric Pohlmann - Emilio Andre
- Veronica Carlson - Gina
- Eleanor Summerfield - Mrs. Evans
- Ian Cullen - Special Branch Man
- Lee Montague - Maurice Rafic
- Dudley Sutton - Sonny
- Donald Houston - John Burnham
- Toby Robins - Selina Trenton
- Kieron Moore - Chris Lomax / Stanley Reeves
- David Prowse - Adolfo
- Wanda Ventham - Leila Rankin
- John Steiner - Hershall
- John Acheson - Captain of Aircraft
- Patrick Waddington - NATO General
- Philip Locke - Topek
- Simon Oates - Mike Taylor
- Richard Caldicot - Robin Skelton and Peter Sinclair
- Iain Cuthbertson - Dr. George Kendall
- Hans Meyer - Lucky Le Beau
- Michael Robbins - Burton
- Cyril Shaps - Esplin
- Sandor Elès - Dominic
- Susan Fleetwood - Miss Bronson
- Jennifer Hilary - Comtesse de Noverre
- Dawn Addams - Dianne Lynne
- Leslie Schofield - Sam
- Sarah Lawson - Miss Wexler
- Alexandra Bastedo - Nicole
- Donal Donnelly - Stacey
- Peter Bowles - Borowitsch
- Anton Rodgers - Terrell
- Isla Blair - Elaine
- Toke Townley - George Parsons
- John Keston - Nazib
- Alan MacNaughtan - Gilford
- Leslie Sands - Draper
- Duncan Lamont - Lowery
- Ronald Lacey - Jeremy Standish
- Stratford Johns - Paul Trenton
- Norman Eshley - Red
- Michael Gothard - Weber
- Norman Bird - Drayton
- John Savident - Captain Svenoski
- Michael Gwynn - Franz Drieker
- Johnny Briggs - 2nd Reporter
- Ann Bell - May Heywood
- Adrienne Corri - Monique Grelle
- Nosher Powell - Carl Young
- Michael Mellinger - Strober
- Guy Rolfe - Yves de Charolais
- Roger Avon - 1st Maintenance Man
- Roger Avon - Hooper
- Garfield Morgan - Mendham
- Geoffrey Chater - Peck
- John Barron - Byrom Blain
- Alan Lake - The Dandy
- John Hallam - Doug Martin
- Gertan Klauber - Antonio Mardi
- John Bailey - Kruger
- Eddie Byrne - Frank Bellman
- Anthony Nicholls - Dr. Grant
- Tony Selby - Mallin
- Derek Newark - Clark
- Michael Barrington - John Heppel
- Anthony Valentine - Cyrus Gregory
- Paul Whitsun-Jones - Martin Kyle
- Paul Whitsun-Jones - Gresford
- Peter Arne - Slovic
- Peter Arne - Segres
- Bernard Horsfall - Captain Carter
- Jean Marsh - Agatha Pollen
- Alex Gallier - Bridge Player
- Anthony Hopkins - Greg Halliday
- Arnold Diamond - Kolliatis
- Patricia Donahue - Ingrid von Etzdorf
- Anouska Hempel - Stewardess
- Marne Maitland - Turkish Caretaker
- Godfrey James - Danvers
- Oliver MacGreevy - Karnack
- Patrick Mower - Greene
- John Cazabon - Chemist
- Kate O'Mara - Pietra
- David Bauer - Cy Harlan
- Neil McCallum - Eddie Curtis
- Patrick Barr - Gen. Crawley
- Tony Steedman - Hallet
- Alan Hockey - Mechanic
- Colin Gordon - Doctor Stickney
- George Pastell - Sarrat
- George Pastell - Camilo Garria
- Edward de Souza - Paul Dupont
- David Gregory - Cal
- Clifford Earl - Dave
- Lois Maxwell - Mary Burnham
- Basil Dignam - Henry Smith
- Basil Dignam - Howard Finch
- Anthony Ainley - Supervisor
- Hana Maria Pravda - Maria Pilic
- Martin Boddey - Harry Finch
- John Nettleton - Carter
- Ronald Radd - Allison
- Frederick Jaeger - Major Harwood
- Juliet Harmer - Trish
- Juliet Harmer - Paula
- William Kendall - Sir Wilfred
- Steve Plytas - Alexandros Lizardos
- Gerald Campion - Eldon
- David Healy - Ramos
- Patrick Westwood - Parkinson
- John Cater - Charles Banjou
- George Pravda - Count Von Streicher
- Cyril Luckham - Walker
- Ray Marioni - Spanish Mechanic
- Brian Worth - Franz Ruckert
- John Ronane - Villiers
- John Carson - Kilvern
- Sally-Jane Spencer - Young Girl in Car
- Ronald Leigh-Hunt - Peregrine Haslet-Wood
- Michael Guest - Rogers
- David L. Lander - Lorio
- Pippa Steel - Trish
- Martin Miller - Prof. Yuri Dutrov
- Peter Graves - Reggie
- Neil McCarthy - Quince
- Robert Russell - Chalmers
- John Bindon - Greer
- Monika Dietrich - Fausta
- John Tate - Henri Rachou
- Hal Galili - Maziol
- Michael Balfour - Eccles
- Larry Taylor - French Driver
- Cyril Frankel
- Roy Ward Baker
- Leslie Norman
- Ray Austin
- Tony Williamson
- Gerald Kelsey
- Donald James
- Terry Nation
Neil McCarthy interpreta a Quince en la serie.
Anthony Hopkins interpreta a Greg Halliday en la serie.
Ronald Lacey hace el papel de Jeremy Standish.
Adrienne Corri interpreta a Monique Grelle en la serie.
Isla Blair interpreta a Elaine en la serie.
Peter Wyngarde hace el papel de Jason KIng.
Rosemary Nicols hace el papel de Annabelle Hurst.
Joel Fabiani hace el papel de Stewart Sullivan.
Dennis Alaba Peters interpreta a Sir Curtis Seretse en la serie.
Capítulo disponible en las siguientes plataformas:
