- Phil Brown - Brownley
- Peter Illing - Captain Omar
- Patrick Troughton - Sukru
- Guy Deghy - Ritter
- Larry Burns - Franz
- Walter Rilla - The Baron
- Ferdy Mayne - Castillon
- Delphi Lawrence - Marie Webber
- David Cameron - David
- Esmond Knight - Von Schriber
- Oliver Burt - Von Stegger
- Jack Stewart - MacLelland
- Martin Wyldeck - German Police Chief
- Marla Landi - Maria
- Alan Tilvern - Johnny Stefano
- Robert Cawdron - Debre
- David Kossoff - Professor Renee
- John Le Mesurier - Monsieur Iamprou
- Balbina - Marie
- André Maranne - Georges
- Cec Linder - Captain Tully
- Gerard Heinz - Mr. Dorner
- Robert Arden - Marston
- Philo Hauser - Carter
- George Margo - Creedy
- Mai Zetterling - Carol
- Robert Rietti - Pinelli
- Peter Vaughan - Inspector
- Hugh Morton - Parker
- Michael Goodliffe - Wolf Barstrom
- Moira Redmond - Nina
- Ernest Clark - Inspector MacAndrew
- Leslie French - Pimm
- Frederick Leister - Sir Isaac Spendler
- John Van Eyssen - Captain Flormann
- Lloyd Lamble - Captain Merrick
- Jan Holden - Jane Grant
- Brown Derby - Inspector Angus
- Derek Tansley - Mr. Burton
- David Davies - Colonel Briggs
- Meredith Edwards - Doctor Gorman
- Oscar Quitak - Abdul
- Errol John - Sergeant Hamid
- Howard Lang - Commander Siddons
- Walter Gotell - Zeist
- Walter Gotell - Fischer
- Lisa Daniely - Helene
- Warren Mitchell - Willi
- Waveney Lee - Lisa
- Leonard Sachs - Carlo
- Leonard Sachs - Muller
- Jean Anderson - Nun
- Annabel Maule - Amy
- Sandra Dorne - Helen Mills
- Michael Brennan - Victor Perrot
- Ewan MacDuff - Roberts
- Donald Stewart - Steve Taylor
- John Crawford - Keflik
- John Crawford - Ben Stack
- John Crawford - Kustrinski
- Howard Pays - Police Driver
- Victor Beaumont - Esler
- Leigh Madison - Emmy
- Kevin Stoney - Onno
- Bruno Barnabe - Capt. Dekker
- Edward Jewesbury - Andrew Slater
- Francis de Wolff - Captain Blink
- Francis de Wolff - Captain Gallard
- Guy Rolfe - Mr. George
- Susan Travers - Carol
- Bill Nagy - Bill Grant
- Bill Nagy - Sash Moran
- Martin Benson - Ahmed
- William Lucas - Cliff McGrath
- Margaret Diamond - Zita
- Brian Worth - Diplomat
- Richard Gale - Ember
- Reed De Rouen - Simms
- Howard Marion-Crawford - Reg Couts
- Howard Marion-Crawford - Peters
- George Pastell - Captain Pagano
- George Pastell - Pagano
- George Pastell - Capt. Pagano
- Steve Plytas - Gonzales
- Alec Mango - Gomiero
- Lloyd Reckord - Sgt. Christie
- Peter Dyneley - LeRoy
- Arnold Diamond - Lambert
- Arnold Diamond - Inspector Krantz
- Alan Gifford - Bonnier
- Harold Kasket - Lenoir
- Harold Kasket - Thibault
- Charles Richardson - Doctor
- Dorinda Stevens - Helen
- Dorinda Stevens - Millicent
- Trevor Reid - Inspector Holt
- Trevor Reid - Cummings
- Paul Stassino - Pavone
- Colette Wilde - Anna Grauber
- Colette Wilde - Shana
- Christina Gregg - Maria
- Julia Lockwood - Louisa Howard
- Maurice Kaufmann - Ronald Millais
- Betty McDowall - Carlotta
- Donald Morley - Lebrun
- Roland Bartrop - Brock
- Roland Bartrop - Grimond
- Roland Bartrop - Grimod
- Roland Bartrop - Amiel
- Christopher Rhodes - Howard
- Cyril Shaps - Gamel
- Cyril Shaps - Slade
- Austin Trevor - Dr. Martin
- Raymond Huntley - Schroeder
- Wendy Williams - Eva
- John Salew - Moltz
- Mary Laura Wood - Anita Ballard
- Elizabeth Wilson - Michele
- Ronald Leigh-Hunt - Hugo Ballard
- Richard Leech - Hanson
- Richard Leech - Finn
- Richard Leech - Garetta
- Tommy Duggan - Cranby
- Leslie Weston - Doc Carson
- Felicity Young - Ruth
- Charles Houston - Graham
- Ursula Howells - Miki
- Stanley Van Beers - Mario
- Stanley Van Beers - Commissaire
- Anthony Dawson - Clouston
- Carl Duering - Dr. Berger
- Carl Duering - Tony D'Ambrosio
- Gordon Tanner - Clyde
- Paula Byrne - Blanche
- Paula Byrne - Mamie
- John Cairney - Lt. Gupta
- William Franklyn - Nevil
- Michael Balfour - Russ
- Michael Balfour - Inspector Hill
- Bernard Cribbins - Sid
- Russell Waters - MacPherson
- Russell Waters - Zelnikov
- Mary Morris - Ingrid Hoffman
- Nanette Newman - Hannah
- Douglas Wilmer - Steinitz
- Francis Matthews - Fawley
- Robert Gallico - Hunter
- Stratford Johns - Inspector Chaublin
- John Chandos - Senator Landau
- John Horsley - Montell
- Jack Lambert - Commander Smith
- Robert Mackenzie - Johnny
- Arthur Lawrence - Hotel Manager
- Lionel Murton - Thakeray
- Anthony Jacobs - Artigas
- Basil Dignam - Insp. Hopkins
- Glyn Owen - Gill
- Julian Sherrier - Baratopi
- Julian Sherrier - De Silva
- Rona Anderson - Lena
- David Knight - Harry
- Hazel Court - Carol LeDuc
- Frederick Jaeger - Bernarde
- Robert Brown - Sergeant at Car Impound
- Robert Brown - Attendant
- John Kidd - Piere
- Patrick Jordan - Cpl. Khan
- Edwin Richfield - Inspector Mornay
- Edwin Richfield - Inspector Jean Mornay
- Henry Oscar - Renoir
- Neal Arden - Commandant
- John Bentley - Dave Carson
- Dervis Ward - Colonel
- Donald Pleasence - Karl Haussman
- Frederick Piper - Inspector Malcolm
- John Longden - Lord Ruskington
- W. Thorp Deverreux - Mottier
- Jane Hylton - Suzy
- Lee Montague - Dikalos
- Harry Landis - Attendant
- Rupert Davies - Coetzee
- Alfred Burke - Martin Bekker
- Philip Ray - Mr. Meyer
- Arthur Gomez - Costa
- Gaylord Cavallaro - David Baker
- Barbara Shelley - Diana
- Arnold Bell - Artigas
- David Lander - Luis
- Marne Maitland - Bhandari
- Laurence Payne - Porton
- John Gatrell - Buchanan
- Colin Croft - Pat Adams
- Robert Lynn
- Charles Frend
- Norman Harrison
- Max Varnel
- George Pollock
- David MacDonald
- Connery Chappell
- Brian Clemens
- John Kruse
- Neville Dasey
- Max Marquis
- Larry Forrester
Frederick Piper interpreta a Inspector Malcolm en la serie.
Peter Vaughan hace el papel de Inspector.
Carl Duering interpreta a Tony D'Ambrosio en la serie.
Charles Korvin hace el papel de Inspector Paul Duval.
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