Skip to main content
  1. Home
  2. Entertainment
  3. Reviews

The Undeclared War review: a cybersecurity thriller that never quite clicks

Add as a preferred source on Google
Simon Pegg and Alex Jennings stand in an office together in The Undeclared War.
Playground Entertainment/Peacock

“Why you can trust Digital Trends – We have a 20-year history of testing, reviewing, and rating products, services and apps to help you make a sound buying decision. Find out more about how we test and score products.“

For a show about cutting-edge cyber warfare, there is something charmingly low-rent about The Undeclared War. The new British espionage thriller from writer-director Peter Kosminsky doesn’t look or feel like so many of the ultra-serious, prestige TV productions that have become all too common nowadays. Instead, the series’ minimalistic, natural cinematography makes it look more like an early 2000s TV miniseries, complete with the kind of title cards and accompanying typewriter sound effects that would be more at home in an episode of NCIS than a series starring the likes of Simon Pegg and Mark Rylance.

Recommended Videos

The Peacock show’s low-budget aesthetic may turn off some viewers, as will its decision to visualize many of its hacking sequences by diving straight into certain characters’ problem-solving minds. Those sequences, like many things in The Undeclared War, range from enthralling to ridiculous, but the series’ willingness to commit fully to all of its choices is one of its most endearing qualities. Not everything in The Undeclared War works, but it’s a testament to the work done by everyone involved in it that the series feels so passionately made from top to bottom.

Simon Pegg and Alex Jennings stand in an office together in The Undeclared War.
Playground Entertainment/Peacock

Set in 2024, The Undeclared War follows a team of security analysts and hackers who are tasked with protecting the United Kingdom from cyber attacks. Their skills are quickly put to the test in the series’ premiere when a mysterious malware attack disables part of the U.K.’s economic infrastructure. To make matters worse, as the show’s central cybersecurity team does its best to minimize the attack’s damage in the weeks leading up to an important general election, a college intern named Saara Parvan (played by newcomer Hannah Khalique-Brown) begins to suspect that there may be more attacks heading Britain’s way.

Over the course of its six episodes, The Undeclared War follows Saara as she attempts to get ahead of the U.K.’s mysterious attackers before they can throw the entire nation into chaos. Along the way, Saara catches the attention of both her GCHQ boss, Danny Patrick (Pegg, not too far from his Mission: Impossible exploits), and an assertive NSA agent from the United States named Kathy (Maisie Richardson-Sellers). In a strange twist of fate, Saara also finds herself pursuing a friendship with John Yeabsley (Rylance), an older GCHQ employee who longs for the days when the world of espionage felt more handmade and tactile.

By rooting The Undeclared War so firmly in Saara’s outsider perspective, Kosminsky and co. are able to gradually but efficiently submerge viewers in the series’ world of cybersecurity. It doesn’t take long, though, for some of the show’s older characters — namely, Pegg’s Danny, Rylance’s John, and Alex Jennings’ David Neal — to emerge as more compelling and commanding figures than Saara. Despite that, The Undeclared War frequently prioritizes Saara’s personal journey over its other storylines.

Hannah Khalique-Brown kneels in a grass field in The Undeclared War.
Playground Entertainment/Peacock

In its second half, the series often turns its attention to Saara’s personal relationships, including a superfluous love triangle that begins to grow between herself, her activist boyfriend, James (Edward Holcroft), and Richardson-Sellers’ Kathy. By doing so, The Undeclared War ultimately fails to strike the right balance between melodrama and espionage.

The series’ unyielding focus on Saara’s romantic troubles is particularly baffling considering how genuinely compelling The Undeclared War’s cybersecurity sequences are. Kosminsky constructs many of the series’ GCHQ scenes out of long, handheld camera takes, which follow the organization’s workers through various rooms and halls as they race to try to get on top of the attacks that are being launched against them. These sequences, as well as many of the show’s hacking scenes, are thrillingly executed, and they feel propulsive in a way that so many of The Undeclared War’s weaker sections do not.

Unfortunately, the show’s attempts to weave its flatly drawn melodramatic subplots into its tightly wound, overarching espionage story are the source of The Undeclared War’s biggest problems. At times, the series feels as thrilling and involving as anything you’ll likely see on TV this year. However, there are other instances when The Undeclared War feels no more special or well-realized than a daytime TV soap opera.

Mark Rylance stands near a window in The Undeclared War.
Playground Entertainment/Peacock

The show’s narrative shortcomings, thankfully, do not impact the performances given by its cast members, many of whom turn in strong work throughout The Undeclared War’s six episodes.

That’s especially true when it comes to The Outfit‘s Mark Rylance, who injects the series with his usual quiet gravitas. Simon Pegg, meanwhile, turns in a delightfully understated performance as Danny, a man who is decidedly not prepared for the severity of the threat he finds himself facing in The Undeclared War. Although the series’ latter installments turn Saara into an increasingly passive and reactive protagonist as well, Hannah Khalique-Brown always manages to deftly navigate and portray her character’s intense internal conflict.

The Undeclared War | Official Trailer | Peacock Original

In its final moments, The Undeclared War does also succeed at bringing its story to a close on a satisfyingly somber, bittersweet note, one that makes it clear just what kind of sacrifices have to be made in order to maintain peace during a time when the click of a computer mouse can do more damage than most bombs. That’s a message that is undeniably important to remember these days, which is why it’s such a shame that The Undeclared War doesn’t communicate it as smoothly as it could have.

The Undeclared War begins streaming Thursday, August 18 on Peacock. Digital Trends was given access to all six of the show’s episodes.

Alex Welch
Former Digital Trends Contributor
Alex is a writer and critic who has been writing about and reviewing movies for years. He was previously the Managing Editor…
3 underrated movies you can watch for free this weekend (Oct 31- Nov 1)
No subscription needed for these three emotionally heavy, totally free picks.
dinner-in-america-movie-poster

I'm an avid movie watcher, and some of my favorite movie nights have cost me absolutely nothing. This weekend's picks are all free to stream, and they don't hold anything back. One traps you in a room with grieving parents, another throws punk rock at suburbia, and the last might wreck you beautifully.

We also have guides to the best new movies to stream, the best movies on Netflix, the best movies on Hulu, the best free movies, and the best movies on Amazon Prime Video.

Read more
Donald Glover is making a live-action PUBG series for Netflix, and he’ll star in it too
The Atlanta creator will also direct and co-write the adaptation with his brother Stephen Glover
donald glover pubg netflix series

Donald Glover is heading into PUBG, and he's taking on considerably more work than surviving a match. Netflix is developing a live-action series based on the battle royale game, with the Atlanta creator attached to star and direct.

Krafton confirmed the project, which Glover will co-write with his brother Stephen. Both will also executive produce, putting the brothers to work on the adaptation's scripts while Donald takes a role in front of the camera.

Read more
EXCLUSIVE: Here’s why Wildwood is the best animated movie of the year
Laika’s Wildwood is a stop-motion masterpiece and one of the best animated films ever
Prue riding on an eagle in the film Wildwood.

Laika has delivered multiple animated classics like Coraline, ParaNorman, and Kubo and the Two Strings. But with Wildwood, the studio delivered a revolutionary magnum opus that showcases the best of stop-motion storytelling. Directed by Travis Knight (Masters of the Universe), this movie follows teenager Prue (Peyton Elizabeth Lee) as she and her friend Curtis (Jacob Tremblay) venture into a magical forest to rescue her baby brother from a murder of crows sent by the evil sorceress Alexandra (Carey Mulligan).

2026 saw the release of multiple animated hits, including Hoppers, Toy Story 5, The Super Mario Galaxy Movie, Avatar Aang: The Last Airbender, GOAT, and Forgotten Island. However, with its mature story, realistic characters, and jaw-dropping animation, Wildwood has proven itself the top contender for Best Animated Feature at this year's Oscars.

Read more