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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.
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Season 26 episodes · 2026+
Episode 1 · 21 Jul 2026 · 20:00 · 48 min
Episode 1
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...
Episode 2 · 21 Jul 2026 · 20:00 · 47 min
Episode 2
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?
Episode 3 · 21 Jul 2026 · 20:00 · 48 min
Episode 3
When Barbara's charming ex-boyfriend, Nicky Chan, re-appears in her life, she must make an impossible decision.
Episode 4 · 21 Jul 2026 · 20:00 · 48 min
Episode 4
While Danny becomes increasingly concerned about Barbara's erratic behaviour, malware causes havoc across British government departments, forcing Danny and Roz to work together.
Episode 5 · 21 Jul 2026 · 20:00 · 43 min
Episode 5
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.
Episode 6 · 21 Jul 2026 · 20:00 · 47 min
Episode 6
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.
Season 16 episodes · 2022+
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