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Season 2 – The Undeclared War

Play trailer Poster for Season 2 – The Undeclared War Jul 2026 Crime Drama Mystery & Thriller Play Trailer Watchlist
Watchlist Tomatometer Popcornmeter
67% Tomatometer 6 Reviews Popcornmeter Fewer than 50 Ratings
Set in a post-pandemic 2024 in the run up to a British general election, a leading team of analysts buried in the heart of GCHQ secretly works to ward off a cyberattack on the country's electoral system. Saara Parvan is a young student getting work experience in the malware department when a security breach leads to a high-stakes first day at the office. She's quickly thrust into the center of an escalating data war with Russia that has dangerous implications extending far beyond cyberspace.

Critics Reviews

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Anita Singh Daily Telegraph (UK) Jul 27
3/5
I can’t give away any spoilers, but I can say that, having watched all six episodes, the series kicks into gear around halfway through as we learn the mole’s identity, backstory and motivation. This is engrossing in a way that the cyber stuff isn’t. Go to Full Review Carol Midgley The Times (UK) Jul 25
3/5
It’s perfectly functional as a series, I’m just not sure I have the patience. Go to Full Review James Hibbs Radio Times 2d
3/5
The Undeclared War may have lost some of its ambition, but it now feels like a drama that appreciates that no catastrophe is as compelling as one driven by intimate, human stories. Go to Full Review James Walton The Spectator Jul 31
Kosminsky’s version wasn’t without its qualities, but it wore its research so heavily that watching it sometimes felt a bit like doing homework. Teevan’s, while still well-informed, proves more unbuttoned, more gripping -- and, in short, more fun. Go to Full Review Pat Stacey Irish Independent Jul 27
2.5/5
The Undeclared War, for all its faults, once felt like a series of the moment. Now it feels like one whose moment has long passed. You wonder why they bothered resurrecting it. Go to Full Review Christopher Stevens Daily Mail (UK) Jul 24
2/5
If you're the type of viewer who can't imagine any job title more thrilling than that of a line manager in the Civil Service's security branch, The Undeclared War will keep you on the edge of your seat. Go to Full Review Read all reviews

Audience Reviews

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P T @RT35009267 2d Captivating from beginning to end. The ½ star missing is only because there's a few times when it feels like more explanation can be given to a fact bring a fact rather than "This is XYZ because it is". See more S M @RT90328621 Jul 31 I skipped a lot of it because it was kind of boring. The shows focus changed and didn't feel the same See more Read all reviews
The Undeclared War — Season 2

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Cast & Crew

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Adrian Lester

Andrew Makinde

Ed Stoppard

Richard Marston

Alex Jennings

David Neal

Simon Pegg

Danny Patrick

Tom McKay

Max Kelly

Jason Tobin

Nicky Chan

Episodes

Episode 1 Aired Jul 21, 2026 Danny deals with the aftermath of the Russian cyberattack; Saara makes a shocking discovery about how the Russians broke into the GCHQ system, revealing there's a mole and that it must be one of their own. Details Episode 2 Aired Jul 22, 2026 Vadim finds himself transported to a secret cyber enterprise in China and must try to escape; at GCHQ, Danny and Roz clash over whether to trust Vadim's intel; Saara uses her coding expertise to help Charlie begin the search for the mole. Details Episode 3 Aired Jul 28, 2026 In 2014, Barbara crosses paths with her ex-boyfriend Nicky on a fated MI6 mission in Hong Kong; in 2022, now settled into her nine-to-five job at GCHQ, she once again meets with Nicky, discovering the painful truth of who he really is. Details Episode 4 Aired Jul 29, 2026 Chinese malware causes havoc across government departments, leading Danny and Roz to reluctantly work together to stop the worm from spreading; Barbara tries to find Nicky to confront him as she realizes she's close to being discovered. Details Episode 5 Aired Aug 3, 2026 Barbara finally comes under Charlie's scrutiny; Danny and Roz's teams join forces to get Vadim to safety so he can hand over the ciphertext, the key to understanding and defeating the malware; Barbara gives Danny a clue to her devastating secret. Details Episode 6 Aired Aug 4, 2026 Danny confronts Barbara; her conscience is put to the test when she's presented with an impossible choice; Roz and the team must race against time to discover what the malware is searching for and stop it from reaching its final destination. Details

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The Undeclared War — Season 2

The Undeclared War View more photos

Season Info

Director
Paul McGuigan
Executive Producer
Colin Callender, Peter Kosminsky, Noëlette Buckley, Paul McGuigan, Colin Teevan, Daniel Gratton
Screenwriter
Colin Teevan, Emily Marcuson, Amy Ng, Roland Walters
Network
Peacock
Rating
TV-MA
Genre
Crime, Drama, Mystery & Thriller
Original Language
British English
Release Date
Jul 21, 2026
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