- Scott Handy - David Hexton
- Gabrielle Scharnitzky - Kitty
- Nick Holder - Comic
- James Northcote - Waiter
- Yana Yanezic - Katia
- Hugh O'Brien - Gentleman (uncredited)
- Velibor Topic - KGB Hood
- Steven Mackintosh - Tom Mallory
- Emma Fielding - Valerie Parkwood
- Georgina Rich - Alice
- Jon Glover - Public Information Film Narrator
- Riky Ash - Vasily
- Richard Buck - Plain Clothes Police Officer (uncredited)
- Gemma Chan - Chen Mei
- Anton Lesser - C
- Todd Boyce - Hank Chambers
- Adam James - George
- Yuri Klimov - Kasimir
- Marcel Iureș - Arkady
- Rachael Stirling - Kate
- Rachael Stirling - Kate Wilkinson
- Alistair Petrie - Andrew
- Jessica Boyde - Celine
- Enzo Squillino Jr. - Hotel Proprietor
- Goran Navojec - Bogdan Rodchenko
- Andrew Bicknell - Martin
- Craig Conway - Philip Denmoor
- David Verrey - Edgar
- Victoria Alcock - Bath House Lady
- Laurence Kinlan - IRA Man
- Joe Egan - The Big Fella
- Stefan Boehm - MI5 Clerk
- Judy Parfitt - Hester Waterhouse
- Yevgeni Sitokhin - Odin
- Tim Bentinck - Home Secretary
- Chris Cowlin - Member of Special Branch (uncredited)
- Jay Simpson - Colin Blakefield
- Richard McCabe - Prime Minister
- Julia Krynke - Embassy Woman
- Laurentiu Possa - Hood
- Hermione Gulliford - Secretary to the Home Secretary
- Doreene Blackstock - Nurse
- Bartley Burke - Ivan
- Ian Hanmore - Dennis Lamb
- Paul Kennington - Russian Spy
- Hilary Salmon
- Rachel Freck
- Toby Whithouse
- Radford Neville
- Faith Penhale
- Daniel Pemberton
- Philip Clements
- Simon Farmer
- Peter Burgis
- Jim Goddard
- Stuart Hilliker
Ian Hanmore interpreta a Dennis Lamb en la serie.
Steven Mackintosh interpreta a Tom Mallory en la serie.
Tom Hughes hace el papel de Joe Lambe.
Jonathan Aris hace el papel de Alan Montag.
Victoria Hamilton interpreta a Sarah Montag en la serie.
Shaun Dooley interpreta a DC Jim Fenchurch en la serie.
Brian Cox hace el papel de Daddy.
Paul Ritter hace el papel de Bobby Waterhouse.
Chloe Pirrie hace el papel de Wendy Straw.
Zana Marjanović interpreta a Yulia en la serie.
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