- Johnny Briggs - Ted Clayton
- Marius Goring - Mr Ponge
- Marius Goring - The Interrogator
- John Gielgud - The Writer
- Sylvia Syms - Judy Marriott
- Tenniel Evans - Padstow
- Clifton Jones - Pieter Amidou
- Terence de Marney - Flanders
- Dan Jackson - Adzola
- Gillian Lewis - Angela
- Julian Glover - Spangle
- Nigel Davenport - The Prisoner
- Richard Pearson - Cloon
- Athol Coats - Executioner
- Colin Jeavons - Conspirator
- Kenneth Griffith - Mr Rounds
- Megs Jenkins - Miss Wellcome
- Mary Kerridge - Miss Colduck
- Miriam Karlin - Marcella Vankuchen
- Sam Wanamaker - Solomon Ithimar, PhD
- Michael Aldridge - Henry Shoreham
- Antony Carrick - Correspondent
- Patricia Routledge - Beryl Turner
- Alfred Burke - First Man
- Dean Stockwell - The Man
- Scott Forbes - Kender
- John Junkin - Jeffrey
- Leo McKern - Mark
- Barry Jackson - Ed
- Brian Wilde - Mr Shater
- Brian Wilde - Shyster
- Michael Graham Cox - Albert
- David McKail - Fisher
- Alec Guinness - The Executioner
- George Cole - Caramel
- George Cole - Paul Bishop
- Maurice Denham - Crowther
- Norman Rossington - Zinoviev
- Norman Rossington - Connor
- Norman Rossington - Mr. Dross
- Lee Montague - Lenin
- Lee Montague - Shuki
- David Collings - Sverdlov
- John Bailey - Walter Dix, MP
- Ann Firbank - Sally Dix
- Michael Goodliffe - The Minister
- Erik Chitty - Mr. Aylwood
- Barbara Lott - Grace Hornchurch
- Mary Webster - Sheila
- Prunella Scales - Marie
- Barry Evans - Tommo
- Harold Kasket - Barman
- Jimmy Gardner - Elderly Sam
- Jimmy Gardner - Little Tom
- Harry Landis - Frank
- Michael Brennan - Leonard
- Paul Angelis - Susie
Dean Stockwell interpreta a The Man en la serie.
Miriam Karlin interpreta a Marcella Vankuchen en la serie.
Marius Goring interpreta a Mr Ponge en la serie.
Tenniel Evans hace el papel de Padstow.
Clifton Jones interpreta a Pieter Amidou en la serie.
Brian Wilde interpreta a Shyster en la serie.
George Cole interpreta a Paul Bishop en la serie.
Norman Rossington interpreta a Mr. Dross en la serie.
Lee Montague interpreta a Lenin en la serie.
Jimmy Gardner interpreta a Elderly Sam en la serie.
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