Channel 4 · To Be Determined

The Undeclared War

Drama, Thriller · 2022 · Rated 7.3/10

Last aired: S2 E6, Episode 6 · 2026-07-21

Set in 2024, The Undeclared War tracks a leading team of analysts buried in the heart of GCHQ, secretly working to ward off a series of cyber-attacks on the UK in the run up to a general election. When a routine stress test of internet infrastructure goes awry 21-year-old GCHQ intern Saara Parvin suddenly finds herself operating on the invisible frontier of high-stakes cyber warfare.

Cast

Simon Pegg Danny Patrick

Joss Porter Phil Draper

Hannah Khalique-Brown Saara Parvan

Tom McKay Max Kelly

Alex Jennings David Neal

German Segal Vadim Trusov

Ed Stoppard Richard Marston

Adrian Lester Andrew Makinde

Maisie Richardson-Sellers Kathy Freeman

Edward Holcroft James Cox

Siân Brooke Barbara Napier

Danny Sapani Charlie Francis

Hattie Morahan Elizabeth Kahn

Chloe Pirrie Roz Cavendish

Gavin Spokes Alex Sheldon

Mark Rylance John Yeabsley

Tinatin Dalakishvili Marina Veselova

Kerry Godliman Angie McMurray

Jason Tobin Nicky Chan

ЭФ

Эдуард Флёров Felix Trusov

Janina Elkin Ludmilla Trusov

НС

Николай Сердцев Boris Leonov

Season 2

Season 1 Season 2

E1 Episode 1 2026-07-21 · 48 min Danny is under huge pressure dealing with the fallout from the Russian cyber-attack when a bold new threat emerges. Saara discovers that there's a mole in GCHQ. And Vadim is missing and in danger...

E2 Episode 2 2026-07-21 · 47 min Vadim realises that he must try to escape captivity in Shenzhen. Back at GCHQ, Danny and Roz clash over China. And has Charlie unearthed the mole?

E3 Episode 3 2026-07-21 · 48 min When Barbara's charming ex-boyfriend, Nicky Chan, re-appears in her life, she must make an impossible decision.

E4 Episode 4 2026-07-21 · 48 min While Danny becomes increasingly concerned about Barbara's erratic behaviour, malware causes havoc across British government departments, forcing Danny and Roz to work together.

E5 Episode 5 2026-07-21 · 43 min Barbara comes under Charlie's scrutiny as tragedy strikes GCHQ. Danny, Saara and Roz attempt to help Vadim escape. And Danny makes an earth-shattering discovery.

E6 Episode 6 2026-07-21 · 47 min Danny puts everything on the line in order to right some wrongs. Meanwhile, Roz and the team must race against the clock to find out what the malware is searching for.

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