Channel 4
The Undeclared War
GCHQ analysts fighting a state-backed cyberwar discover that the apparent Russian attack hides a more dangerous adversary and a mole inside the agency, forcing Saara Parvin and Danny Patrick into a new intelligence crisis.
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Quick Facts
AI Summary
GCHQ analysts uncover a mole and a new state-backed cyber threat after realizing the Russian attack they survived may have concealed a more dangerous adversary.
Series Details
Series Overview
- Premise
- GCHQ analysts defend the United Kingdom against sophisticated state-backed cyberattacks while political pressure, espionage and hidden loyalties complicate the response.
- Setting
- A near-future version of 2024 centered on GCHQ, government security and international cyber conflict.
- Tone
- Serious cyber-espionage thriller mixing malware investigations, intelligence tradecraft, political tension and personal betrayal.
Series 2
- Premiere
- Series 2 premieres on Channel 4 on July 21, 2026.
- Episode count
- The second series contains six episodes.
- New threat
- The GCHQ team discovers that Russia was not the true architect of the previous attack and faces a new adversary.
- Internal danger
- Saara identifies irregular information flows that indicate a mole is operating inside GCHQ.
Current Interest
- Fresh return
- The long-awaited second series returns four years after the original six-episode run.
- Search hooks
- GCHQ mole identity, Barbara Patrick, Chinese malware, Vadim's fate, Series 2 episode guide, ending, cast changes and Series 3.
- Current timing
- The second-series premiere airs July 21, 2026 at 9pm on Channel 4.
Episodes
S01E01
S01E02
S01E03
S01E04
S01E05
S01E06
Episode 1
Computer science student Saara Parvin begins a placement at GCHQ just as a major cyberattack disrupt... · 48 min · Jun 30, 2022
Episode 2
Saara discovers a suspicious encrypted line inside the malware and follows a dangerous lead while GC... · 48 min · Jul 7, 2022
Episode 3
Saara's former classmate Vadim returns to St Petersburg and is drawn into Russia's cyber operations,... · 57 min · Jul 14, 2022
Episode 4
Saara is caught between protecting a confidential source and new intelligence that could expose the... · 46 min · Jul 21, 2022
Episode 5
Civil unrest spreads after interference in the British election, a damaging data leak threatens inte... · 48 min · Jul 28, 2022
Episode 6
Saara and Vadim work from opposite sides of the conflict to expose the hidden level of the malware a... · 48 min · Aug 4, 2022
Cast & Characters
Simon Pegg
Danny Patrick
Hannah Khalique-Brown
Saara Parvin
Siân Brooke
Barbara Patrick
Alex Jennings
David Neal
Danny Sapani
Charlie Francis
Ed Stoppard
Richard Marston
Chloe Pirrie
Lt Colonel Roz Cavendish
German Segal
Vadim Trusov
Adrian Lester
Prime Minister Andrew Makinde
Jason Tobin
Nicky Chan
Mark Rylance
John Yeabsley
Danny Patrick
Character
Saara Parvin
Character
Barbara Patrick
Character
Vadim Trusov
Character
Roz Cavendish
Character
Crew
Peter Kosminsky
Original Co-Creator / Executive Producer
Colin Callender
Original Co-Creator / Executive Producer
Colin Teevan
Series 2 Writer / Executive Producer
Paul McGuigan
Series 2 Director / Executive Producer
Daniel Gratton
Executive Producer
Noëlette Buckley
Executive Producer
Caroline Levy
Series 2 Producer
Debbie Wiseman
Composer
Where to Watch
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