When Did The Undeclared War Premiere?

The Undeclared War premiered on Thursday, August 27, 2026. The Undeclared War premiered on Thursday, August 27, 2026. The Undeclared War premiered on Thursday, August 27, 2026. The Undeclared War returns on Thursday, August 27, 2026 on Peacock. Live countdown, cast, and season details.

Set in a post-pandemic 2024 in the run up to a British general election, a leading team of analysts buried in the heart of GCHQ secretly works to ward off a cyberattack on the country’s electoral system. This is a season 2 premiere of The Undeclared War. It airs on Peacock. The cast includes Tom McKay, Hannah Khalique-Brown, Aysha Kala, Simon Pegg, Mark Rylance. Episodes run about 47 minutes.

The Undeclared War premiered on Thursday, August 27, 2026.