- Julie Martin - Polly Higginbottom
- Bruce Boa - Bill Douglas
- Hal Galili - Art Bronovsky
- Hal Galili - Guard
- Noel Howlett - Sir Thomas Hewitt
- Justine Lord - Steve Thornton
- Frank Middlemass - Mr. Berans
- Patrick Newell - Donald Keynes
- Robert Raglan - Michael Cater
- Barry Foster - Robert Driscoll
- John Tate - Uncle Jed
- John Tate - Milt Addis
- John Tate - Tosh Brinkwater
- Earl Cameron - Thomas
- Mary Webster - Thea
- Joss Ackland - Sam Jardine
- Joss Ackland - Considine
- Joss Ackland - Mr. Gibbon
- Joss Ackland - Lewis
- Michael Brennan - Matt Lawson
- Saeed Jaffrey - Sunil Seth
- Donald Pickering - Rawlings
- Derren Nesbitt - Lanyon
- Geoffrey Palmer - Jeremy Martin
- John Savident - Francis Pearce
- Brian Wilde - Hodges
- John Junkin - Macann
- Nigel Stock - Arthur Rogers
- Nigel Stock - Herr Schlilling
- Windsor Davies - Aneurin Griffith
- Barry Jackson - Ted Lacock
- Robert James - Alastair McFee
- Peter Baldwin - Doctor
- Brian Blessed - Eddie Barnaby
- Michael Graham Cox - Yuri Konchalovsky
- John Brandon - George Reugen
- John G. Heller - Herr Kuhn
- Elizabeth Shepherd - Frau Lenz
- Vladek Sheybal - Herr Lenz
- John Meillon - Conway
- John Bailey - Richard Short
- Tsai Chin - Esther Ho
- Johnny Briggs - Tim Devlin
- Frank Gatliff - Lin Dak San
- Walter Gotell - Ian Webster
Earl Cameron interpreta a Thomas en la serie.
Geoffrey Keen interpreta a Brian Stead en la serie.
Ray Barrett interpreta a Peter Thornton en la serie.
Philip Latham interpreta a Willy Izard en la serie.
Capítulo disponible en las siguientes plataformas:
