The Undeclared War
The Undeclared War is a TV show on Channel 4. Thriller about a leading team of analysts in GCHQ secretly working to ward off a series of cyber-attacks on the UK in post-pandemic 2024. Starring Simon Pegg, Hannah Khalique-Brown and Siân Brooke. The program has been available since 2026. A total of 6 episodes have been broadcast, most recently in August 2026.
Last episode
55:00
55:00The Undeclared War
Series finale of the cyber thriller with Simon Pegg and Siân Brooke. Danny risks everything in order to right some wrongs, as the malware attack and the mole hunt come to a head. (S2 Ep6/6)
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50:00Cyber thriller with Simon Pegg and Siân Brooke. Barbara comes under Charlie's scrutiny as tragedy strikes GCHQ. Meanwhile, can Danny, Saara and Roz help Vadim to escape? (S2 Ep5/6)
55:00Cyber thriller with Simon Pegg and Siân Brooke. While Danny becomes increasingly concerned about Barbara's erratic behaviour, malware causes havoc across government departments. (S2 Ep4/6)
55:00Cyber thriller with Simon Pegg and Siân Brooke. When Barbara's charming ex-boyfriend, Nicky Chan, re-appears in her life, she is forced to make an impossible decision. (S2 Ep3/6)
55:00Cyber thriller with Simon Pegg and Siân Brooke. Vadim finds himself working in captivity for the Chinese. At GCHQ, Danny and Roz clash over China, and the mole hunt continues... (S2 Ep2/6)
55:00The cyber thriller returns with Simon Pegg and Siân Brooke. At GCHQ, Danny's under pressure dealing with the fallout from the Russian cyber-attack when a bold new threat emerges. (S2 Ep1/6)