Every season of The Undeclared War ever, ranked from best to worst by thousands of votes from fans of the show. The best seasons of The Undeclared War!

A young intern's first day at GCHQ coincides with a major cyberattack on the UK. To win her superiors' trust, she breaks ranks to analyse the malware code without permission and uncovers a greater threat missed by others.

Episode 1

Saara befriends John, a veteran GCHQ staffer, and seeks help from Gabriel in decrypting a message in the virus. Danny signs off on Saara attending a cyber conference with US agent Kathy, aware that Russian intelligence will also be there.

Episode 2

Vadim returns to Russia where his allegiances are tested, leading him to a risky stunt.

Episode 3

With Saara in a difficult position, a revelation forces her hand. Marina moves to London.

Episode 4

Signs of irregularity in the UK general election result prompt political unrest, and the nation's relationship with its allies is threatened. Saara makes a devastating discovery.

Episode 5

As the true extent of Russia's interference with the UK becomes clear, Saara and her former classmate join forces. Can they uncover the hidden code and prevent a war?

Episode 6

In the post-pandemic world of 2024 during an upcoming British general election involving the UK’s first Black Conservative prime minister, a leading team of analysts at the heart of the UK’s NSA-style spy agency GCHQ attempt to ward off a cyber-attack on the country’s electoral system.

The Best Seasons of The Undeclared War

The Best Seasons of The Undeclared War

Season 1