- Julie Barclay - Sally J
- Bharti Patel - Yasmin Parvin
- Nitin Ganatra - Ahmed Parvin
- Gavi Singh Chera - Sajid Parvin
- Robert Cavanah - Campbell Scott
- Melanie Gutteridge - Chrissie
- Aysha Kala - Amina Parvin
- Jamie Muscato - Finn
- Andrew Rothney - Rich T
- Nik Howden - Adjudicator
- Zaqi Ismail - Zahir
- Tom McKay - Max K
- Joss Porter - Phil D
- Julian Harries - National Security Advisor
- Chike Chan - Chen
- German Segal - Vadim Trusov
- Daf Thomas - Young Male Canvaser
- Tinatin Dalakishvili - Marina Veselova
- Eduard Flerov - Felix Trusov
- Janina Elkin - Ludmilla Trusov
- Николай Сердцев - Boris Leonov
- Alex Romashov - Pyotr
- Daniel O'Meara - Newscaster
- Andrew Byron - Glavset Supervisor
- Ernest Gromov - Yevgeny
- Yanina Hope - FSB Lecturer
- Kerry Godliman - Angie McMurray
- David Prosho - Steve Cleary
- Oliver Powell - Daz Wiskowski
- Sacha Plaige - Camerawoman
- Gediminas Adomaitis - Vasily
- Sukh Ojla - Polling Clerk
- Rekha John-Cheriyan - Farzhana Shah
- Ashley Zhangazha - Robert Adebayo
- Victoria Broom - Alex
- Florence Bell - Millie W
- Isaura Barbé-Brown - Annie
- Dan Ball - Mark Milsome
- Paula Kaye - Adede
- Lucas Hare - Jack Barker
- Keiron Self - Lt. Colonel Andy Marsh
- John Schwab - Matthew Mitchie
- Iain McKee - Peter Walker
- Irena Tyshyna - Russian Interviewer
- Charles Abomeli - General Landsman
- Tom Mumford - Police Sergeant
- Jessica Layde - PC Sandy Bishop
- Martin Trenaman - Harry Davies
- Alex Reid - Colonel Pauline Keele
- Yuri Klimov - Russian General
- Brendan Purcell - GCHQ Security Officer
- Robert Jones
Hannah Khalique-Brown interpreta a Saara Parvan en la serie.
Simon Pegg hace el papel de Danny Patrick.
Maisie Richardson-Sellers interpreta a Kathy Freeman en la serie.
Edward Holcroft interpreta a James Cox en la serie.
Adrian Lester interpreta a PM Andrew Makinde en la serie.
Alex Jennings hace el papel de David Neal.
Hattie Morahan hace el papel de Elizabeth Kahn.
Ed Stoppard interpreta a Richard Marston en la serie.
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