- 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 hace el papel de Tom Mallory.
Tom Hughes interpreta a Joe Lambe en la serie.
Jonathan Aris interpreta a Alan Montag en la serie.
Victoria Hamilton interpreta a Sarah Montag en la serie.
Shaun Dooley hace el papel de DC Jim Fenchurch.
Brian Cox interpreta a Daddy en la serie.
Paul Ritter interpreta a Bobby Waterhouse en la serie.
Chloe Pirrie interpreta a Wendy Straw en la serie.
Zana Marjanović hace el papel de Yulia.
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