- Ralph Bellamy
- Â Col. Andy Morgan / ... 2 episodes, 1957
- Kieron Moore
- Â Boleslaw Wierzbianski / ... 2 episodes, 1957
- Eric Pohlmann
- Â General Yin Chang / ... 2 episodes, 1957
- Leonard Sachs
- Â Baron von Kiel / ... 2 episodes, 1957
- Lionel Murton
- Â Captain / ... 2 episodes, 1957
- Ferdy Mayne
- Â Abwehr officer / ... 2 episodes, 1957
- Enid Lorimer
- Â Concierge / ... 2 episodes, 1957
- Jack McNaughton
- Â 1st Reporter / ... 2 episodes, 1957
- Stanley Meadows
- Â 2nd German officer / ... 2 episodes, 1957
- Faith Domergue
- Â Helen Zotos 1 episode, 1957
- Phyllis Calvert
- Â Tatiana 1 episode, 1957
- Peter Arne
- Â Father Maggiore 1 episode, 1957
- Ron Randell
- Â Lt. David Hamilton 1 episode, 1957
- Lee Patterson
- Â Geoffrey Foster 1 episode, 1957
- Eddie Byrne
- Â Sergeant Lanahan 1 episode, 1957
- Serge Reggiani
- Â Sgt. Jean Renaud 1 episode, 1957
- Claude Dauphin
- Â Brother Joachim 1 episode, 1957
- Harry Landis
- Â Mario Belli 1 episode, 1957
- André Morell
- Â Sven 1 episode, 1957
- Nicole Maurey
- Â Nicole Garvet 1 episode, 1957
- Karel Stepanek
- Â Rubici 1 episode, 1957
- Eugene Deckers
- Â Armand LeFoyer 1 episode, 1957
- David Hannaford
- Â Johnny Kalisch 1 episode, 1957
- Richard Thorp
- Â Sgt. James Cross 1 episode, 1957
- Robert Arden
- Â Hal Lehrman 1 episode, 1957
- Dorothy Alison
- Â Miss MacPherson 1 episode, 1957
- Julia Arnall
- Â Tamara Gilmore 1 episode, 1957
- John Van Eyssen
- Â Captain Bauer 1 episode, 1957
- Paul Carpenter
- Â George Herald 1 episode, 1957
- Peter Wyngarde
- Â Andrea Bakolas 1 episode, 1957
- Anton Diffring
- Â Louis Walleau 1 episode, 1957
- Richard O'Sullivan
- Â Thomaso 1 episode, 1957
- Patrick Allen
- Â Corporal Brunowski 1 episode, 1957
- Martin Benson
- Â Dimitrios 1 episode, 1957
- Ewan Roberts
- Â Mr. Frazer 1 episode, 1957
- Nicola Braithwaite
- Â Vicky Gilmore 1 episode, 1957
- Zena Howard
- Â Madame Bonnet 1 episode, 1957
- Jon Farrell
- Â Bob Considine 1 episode, 1957
- John Laurie
- Â The Reverend Ingram 1 episode, 1957
- Alfred Burke
- Â Inspector Maron 1 episode, 1957
- Helen Haye
- Â Baroness von Kiel 1 episode, 1957
- Alan Gifford
- Â John R. Wilhelm 1 episode, 1957
- Robert Raglan
- Â Police Inspector 1 episode, 1957
- Alec Mango
- Â Major Nikos 1 episode, 1957
- Austin Trevor
- Â Camp Commandant 1 episode, 1957
- Larry Cross
- Â George Polk 1 episode, 1957
- Martine Alexis
- Â Gerta 1 episode, 1957
- Hugh Miller
- Â Abbe 1 episode, 1957
- Marianne Walla
- Â Natasha 1 episode, 1957
- Mark Mileham
- Â Toni 1 episode, 1957
- Desmond Jeans
- Â General von Epp 1 episode, 1957
- Nigel Stock
- Â Olaf 1 episode, 1957
- Robert Brown
- Â Erik Richter 1 episode, 1957
- Martin Boddey
- Â The man in gloves 1 episode, 1957
- Richard Shaw
- Â Russian agent 1 episode, 1957
- Betty McDowall
- Â Thelma 1 episode, 1957
- Guy Deghy
- Â 1st MVD Officer 1 episode, 1957
- Gillian Owen
- Â Helena 1 episode, 1957
- John Chandos
- Â Embassy Official 1 episode, 1957
- Stanley Van Beers
- Â Mayor Kuo 1 episode, 1957
- Launce Maraschal
- Â General Coley 1 episode, 1957
- Alaric Cotter
- Â Luigi 1 episode, 1957
- Helen Misener
- Â Madam Bakolas 1 episode, 1957
- Ewen Solon
- Â Mihailov 1 episode, 1957
- Gawn Grainger
- Â Giuseppe 1 episode, 1957
- Lloyd Lamble
- Â Jeff Pritchard 1 episode, 1957
- Gerard Heinz
- Â Dr. Borodin 1 episode, 1957
- Michael Mellinger
- Â Eugene Li 1 episode, 1957
- Iris Russell
- Â Anna Richter 1 episode, 1957
- George Howe
- Â French Premier 1 episode, 1957
- James Dyrenforth
- Â Frank Jerome Riley 1 episode, 1957
- Julian Somers
- Â Polish Captain 1 episode, 1957
- Alexis Bobrinskoy
- Â Chief of Protocol 1 episode, 1957
- George Eugeniou
- Â Petros 1 episode, 1957
- Nicholas Bruce
- Â Colonel Lortel 1 episode, 1957
- Bill Nagy
- Â Pierre J. Huss 1 episode, 1957
- Michael Peake
- Â Colonel H'Su 1 episode, 1957
- Robert Henderson
- Â American Ambassador 1 episode, 1957
- Wensley Pithey
- Â Father Tsouderos 1 episode, 1957
- Howard Lang
- Â Polish Bosun 1 episode, 1957
- Robert Ayres
- Â Colonel 1 episode, 1957
- Gordon Tanner
- Â Charles Delaney 1 episode, 1957
- Wilfred Downing
- Â Alberto 1 episode, 1957
- Julian Sherrier
- Â Captain 1 episode, 1957
- Gerald Andersen
- Â Colonel Simpson 1 episode, 1957
- Sandra Francis
- Â Paulette 1 episode, 1957
- Sylvia Childs
- Â Nurse 1 episode, 1957
- Alan Tilvern
- Â Konstantin 1 episode, 1957
- Carl Duering
- Â Antoni Klimowicz 1 episode, 1957
- Donald Morley
- Â Sergeant 1 episode, 1957
- Cyril Luckham
- Â Maurice Dekobra 1 episode, 1957
- Harold Lang
- Â An Azerbaijanian 1 episode, 1957
- John Harvey
- Â Ship's Captain 1 episode, 1957
- Wolf Frees
- Â Gestapo Major 1 episode, 1957
- Philip Vickers
- Â Frederic Sondern 1 episode, 1957
- Christie Humphrey
- Â Norwegian Mother 1 episode, 1957
- Jack MacGowran
- Â Jimmy Walsh 1 episode, 1957
- Lee Montague
- Â Chen 1 episode, 1957
- Ralph Nossek
- Â An Official 1 episode, 1957
- Hal Osmond
- Â Ship's Steward 1 episode, 1957
- Dennis Edwards
- Â 1st German officer 1 episode, 1957
- John Ruddock
- Â Headmaster 1 episode, 1957
- David Spenser
- Â Nicholas 1 episode, 1957
- Llewellyn Rees
- Â Chief Censor 1 episode, 1957
- Laidman Browne
- Â Father Sterojev 1 episode, 1957
- Stratford Johns
- Â Tom Paddock 1 episode, 1957
- Walter Gotell
- Â Gestapo officer 1 episode, 1957
- Roger Delgado
- Â Argentine Diplomat 1 episode, 1957
- Diane Aubrey
- Â Young Tatiana 1 episode, 1957
- Selma Vaz Dias
- Â Peasant woman 1 episode, 1957
- Maureen Beck
- Â Gina 1 episode, 1957
- Deering Wells
- Â Doctor 1 episode, 1957
- Jerry Stovin
- Â G.I. 1 episode, 1957
- Robert Crewdson
- Â 3rd German officer 1 episode, 1957
- Murray Kash
- Â Airman 1 episode, 1957
- Sylvia Herklots
- Â Peasant Mother 1 episode, 1957
- Julian Strickland
- Â Pablo 1 episode, 1957
- Alan MacNaughtan
- Â Captain Bluecher 1 episode, 1957
- Jack Lambert
- Â 1st Member of Parliament 1 episode, 1957
- Dick Vosburgh
- Â News Photographer 1 episode, 1957
- Arthur Gross
- Â Security Policeman 1 episode, 1957
- Frazer Hines
- Â Bellhop 1 episode, 1957
- John G. Heller
- Â 2nd MVD Officer 1 episode, 1957
- Gerald Cross
- Â 2nd Member of Parliament 1 episode, 1957
- Bruno Barnabe
- Â Head waiter 1 episode, 1957
- Frederick Treves
- Â Radio Announcer 1 episode, 1957
- Phyllis Morris
- Â Mrs. Grodzinski 1 episode, 1957
- Mario Borrelli
- Â Self 1 episode, 1957
- Melvyn Hayes
- Â Gang member (uncredited) 1 episode, 1957
- Pauline Chamberlain
- Â Guest at Embassy Party (uncredited) 1 episode, 1957
- Guy Standeven
- Â SS Guard (uncredited) 1 episode, 1957
- Jim Brady
- Â Man at Press Conference (uncredited) 1 episode, 1957
- Victor Harrington
- Â Hotel Guest (uncredited) 1 episode, 1957
- Richard James
- Â Cast member (uncredited) 1 episode, 1957
- Bunny Seaman
- Â Guest at Embassy Party (uncredited) 1 episode, 1957
- Anna Cameron
- Â Hotel Guest (uncredited) 1 episode, 1957
- Robin Burns
- Â Man Fighting in Market (uncredited) 1 episode, 1957
- Charles Gilliard
- Â Waiter (uncredited) 1 episode, 1957
