Watch Dog Legion

Plot

The London Branch of DedSec, led by Sabine Brandt and her newly crafted AI, Bagley, detect armed intruders planting explosives in the Houses of Parliament. DedSec operative Dalton Wolfe goes to defuse the bombs and discovers the intruders to be members of a rogue hacker group called "Zero Day". While Dalton manages to prevent Parliament's destruction, he is swiftly gunned down by drones commanded by Zero Day's leader, who detonates additional explosives around London and orders an attack on DedSec's hideout, forcing Sabine to shut down Bagley and go into hiding. In the wake of the bombings, the British government contract Albion with restoring order to London and hunting down DedSec, who are held responsible for the chaos, effectively causing social and political unrest amongst the city's inhabitants.

Months later, Albion enforces the law without political oversight, transforming the city into a surveillance state with the aid of SIRS ─ a collation of Britain's intelligence agencies. As a result, London's citizens have their personal liberties severely restricted and their lives constantly monitored,^[5] and those who question Albion's methods are either arrested or disappear, including those being processed for deportation to Europe. In addition, organised crime is on the rise, despite Albion's presence. Although most DedSec members have been arrested or killed by Albion, Sabine resurfaces when she finds a new recruit through the city's ctOS, assigning them to reactivate the group's safehouse and Bagley. DedSec slowly rebuild their strength as they find more recruits who, under Sabine's co-ordination and with Bagley's help, liberate various boroughs by encouraging citizens to rise up in defiance of their oppressors.

During this time, DedSec investigate the bombings and soon discover that both Albion CEO Nigel Cass and Clan Kelley's leader, Mary Kelley, were somehow involved, and are taking advantage of London's current situation for their own ends. DedSec is later contacted by Richard Malik, a member of SIRS, who has a lead on Zero Day and presents evidence that SIRS leader Emily Child was responsible for the bombings. However, when Child confronts DedSec, she reveals that Malik's lead was fake and that he wanted to infiltrate the group to supply their identities to Albion. While trying to capture Malik, DedSec are blamed for another bombing that kills Child and allows Malik to take over SIRS. With Bagley's help, the group eventually capture Malik and clear their names, but learn he wasn't behind the Zero Day bombings.

Continuing their investigation on Cass and Kelley, DedSec discover that the latter helped Zero Day smuggle their bombs into the country and is currently involved in abducting people from a major deportation centre in order to sell them on as either slaves or organ donors. Gaining entry to her slave auction, DedSec confront Kelley and leave her to be executed by her slaves. Shifting focus towards Cass, DedSec learn that he helped to set up Zero Day's bombs, and that he intends to enforce peace across London with an automated drone army. DedSec shut down the drone project and expose Cass' crimes, forcing him to barricade himself in Albion's main base at the Tower of London. Fearful of Cass' reprisal against those who will attempt to arrest him, DedSec are forced to eliminate him.

As DedSec celebrate their actions, Zero Day suddenly hacks the group, stealing the tech they had acquired. Tracing the hack, they quickly discover that Sabine was behind the bombings and Zero Day, and that Cass worked alongside her until he double-crossed her for control of data gathering technology. In response, Sabine sought to restart DedSec simply to get revenge on Cass, recover what he had stolen, and seek out other components she needed. As the group evade Sabine's efforts to stop them, they discover that she intends to use the technology she stole to create a patch for Bagley that will be used to take control of the Britain's ctOS infrastructure, plunging the country into chaos in hopes it will force society to forgo technology and restart. To prevent this, Bagley willingly agrees to be shut down. Avoiding the rampant chaos caused by Sabine across London, DedSec confront and kill her, while successfully shutting down Bagley and preventing the patch being sent across the country.

While the British government reviews its contract with Albion and local law enforcement begins work to resume operations, DedSec finally clear their names and are praised for exposing considerable crimes and corruption across the city. In an epilogue scene, they manage to restore Bagley to his original state, and continue to rely on him to help them expose corruption across the city and finish off loose ends.