- 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 hace el papel de Quince.
Anthony Hopkins hace el papel de Greg Halliday.
Ronald Lacey interpreta a Jeremy Standish en la serie.
Adrienne Corri hace el papel de Monique Grelle.
Isla Blair hace el papel de Elaine.
Peter Wyngarde interpreta a Jason KIng en la serie.
Rosemary Nicols interpreta a Annabelle Hurst en la serie.
Joel Fabiani interpreta a Stewart Sullivan en la serie.
Dennis Alaba Peters hace el papel de Sir Curtis Seretse.
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