- 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 hace el papel de Saara Parvan.
Simon Pegg interpreta a Danny Patrick en la serie.
Maisie Richardson-Sellers interpreta a Kathy Freeman en la serie.
Edward Holcroft interpreta a James Cox en la serie.
Adrian Lester hace el papel de PM Andrew Makinde.
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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