- Freda Dowie - Jean MacKinnon
- William Russell - Peter Kroger
- Tony Jay - Laszlo
- Jane Seymour - Laura Burnett
- Tenniel Evans - Joseph Blenkinsop
- David Daker - Piet Hollander
- John Bay - Sam Lambert
- James Maxwell - Leonid Frengel
- Barbara Shelley - Louisa Galbraith
- Gordon Reid - Willie O'Keefe
- Gareth Hunt - Eddie Malone
- Jack Watson - Douglas MacKinnon
- Frederick Jaeger - Hans Deiter
- Jan Francis - Captain Jane Ashley
- James Grout - Sam McGuire
- Peter Armitage - Sergeant of the Guard
- Laurence Payne - James Prendergast
- Al Mancini - Joe Shapiro
- Naomi Chance - Jane Cowley
- Michael Halsey - Gert Hauser
- Georgine Anderson - Dorothy Graham
- Susan Brown - Anna Kreidner
- Beth Morris - Sue Harrington
- Alan MacNaughtan - Charlie Galbraith
- Frederick Treves - Gilbert Webb
- Michael Coles - Hans Erickson
- Peter Halliday - Jean-Claud de Salle
- Julian Glover - Joe Denver
- Frank Wylie - David Larson
- Jeremy Wilkin - Eric Mackay
- Jenny Hanley - Druscilla Lowndes
- Patrick Jordan - Ernest Crichton
- William Lucas - George Pilgrim
- Anthony Sharp - Henry Wakely
- Angela Browne - Elizabeth Haydon
- Peter Miles - Harry Gold
- Ivan Beavis - George Halloran
- Brian Croucher - Sammy Grey
- Brian Haines - Matthew Reeve
- Alan Hockey - Basil Slaughter
- Aubrey Richards - Taff - Geraint Jenkins
- Eric Mason - Kenny Simpson
- Alan White - Melbourne
- Julian Curry - Simon Hatchett
- Will Stampe - Ernst Bronfman
- James Grant - Ian Duncan
- Bill Mitchell - Harry Friedman
- John Gatrell - Shop Assistant
- Ray Smith - Josef Milcjek
- Billy Cornelius - Karl Grotzen
- Michael Shannon - Milton Webber
- T.R. Bowen - Michael Preston
- Keith Varnier - Tony Hammond
- Victor Brooks - Night Watchman
- Jennifer Baker - Secretary
- Richard Shaw - Joe Hennessy
- Richard Bebb - Sir Charles Hammond
- Ann Morrish - Margaret Burnett
- George Mikell - Max Gunther
- John Rapley - Big Ears
Julian Glover interpreta a Joe Denver en la serie.
Gary Watson interpreta a John Quentin en la serie.
Michael Williams hace el papel de Alan Crowe.
Colin Blakely hace el papel de Lewis Burnett.
Capítulo disponible en las siguientes plataformas:
