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.
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
Episode 1
Danny is under huge pressure as he deals with the fallout of the Russian cyberattack. Saara discover... · · Jul 21, 2026
Episode 2
Vadim realizes he must try to escape captivity in Shenzhen. At GCHQ, Danny and Roz clash over China... · ·
Episode 3
Barbara crosses paths with her ex-boyfriend Nicky Chan, first during an ill-fated MI6 mission in Hon... · ·
Episode 4
Danny becomes increasingly worried about Barbara's erratic behavior as Chinese malware causes havoc... · ·
Episode 5
Barbara comes under Charlie's scrutiny as tragedy strikes GCHQ. Danny, Saara and Roz try to help Vad... · ·
Episode 6
Danny confronts Barbara and puts everything on the line to bring the truth to light, while Roz and t... · ·
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
Gallery & Videos
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