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The Undeclared War Returns for Season 2 on Channel 4

The series returns to focus on a mole inside GCHQ, reveals a broader covert threat, features major creative changes, uses a staggered international release.

Overview

  • The first episode of Season 2 premiered in the U.K. on Channel 4 on Tuesday, July 21, 2026, with episodes available on Channel 4’s streaming service after each broadcast.
  • U.S. viewers will get all six hour-long episodes at once on Peacock on August 27, 2026, giving American audiences a later full-season drop.
  • The story resumes directly from Season 1, is set in 2024, and centers on GCHQ’s Malware Department as Danny and his team hunt a mole and confront a larger, hidden cyber threat.
  • Season 2 keeps leads Simon Pegg and Hannah Khalique-Brown, adds Siân Brooke, Danny Sapani and Chloe Pirrie, omits several Season 1 actors including Mark Rylance and Adrian Lester, and credits Colin Teevan as writer with Paul McGuigan directing.
  • Channel 4 and Film4 have promoted the return as timely given rising real-world cyber-warfare concerns, and the staggered release has prompted coverage about regional access and viewing options for audiences outside the U.K.