Watch Dogs: Legion: Complete Walkthrough & Boss Guide
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🗺️ Main Story Walkthrough
Tick off each step as you go — your progress saves locally, no account needed.
Watch Dogs: Legion opens in a post-Brexit London decimated by a series of bombings falsely attributed to DedSec. The hacktivist collective has been shattered, and your first task is rebuilding it from scratch using the game's defining mechanic: recruiting any ordinary London citizen as a playable operative. The opening mission Squad Goals walks you through the Recruit system — each citizen has a unique skill set, backstory, and personal quest that unlocks them as a permanent operative. Prioritise recruiting an Albion Soldier or Construction Worker early; Albion guards grant access clearance to restricted zones, while Construction Workers bring spider-drones that can infiltrate ventilation shafts without raising alarms. The TOAN app on Bagley's interface marks the best candidates in each borough.
The Body Snatchers chapter reveals that Clan Kelley — an Irish crime syndicate led by Mary Kelley — has been harvesting organs from kidnapped civilians and selling them through a dark-web marketplace called Kelley's Pharmacy. The chapter's missions take DedSec through Kelley-controlled districts including the Southwark docks and the underground bare-knuckle fighting circuit called the Bare Knuckle League. Infiltrating Kelley operations requires stealth or misdirection: using a Kelley Enforcer operative for access is far cleaner than fighting through their heavily armed docks. Inspector Kaitlin Lau of the Metropolitan Police becomes a DedSec ally during this chapter — complete her recruitment mission to unlock a reliable gun-for-hire with police database access.
Albion is the private military contractor that has replaced the Metropolitan Police across London, answering to CEO Nigel Cass and operating under a broad surveillance mandate that makes the city a functional police state. The Zero Tolerance chapter assigns DedSec the task of discrediting Albion by exposing their use of covert data collection and unlawful detention. Recruiting an Albion Drone Operator grants access to Albion's internal network through their own aerial assets. The chapter's centrepiece mission London's Protectors takes you to an Albion facility where you must hack network bypass nodes and ultimately confront Nigel Cass himself inside a prototype combat mech.
The Family Business chapter introduces 404, an underground hacker collective operating out of a derelict arcade in East London. DedSec needs 404's intelligence to understand the full scope of the Zero-Day plot, but 404's leader is deeply suspicious of DedSec's rebuilt structure. The chapter's missions involve infiltrating TOAN data centres and recovering encrypted files that link Zero-Day to Albion's founding. The standout mission in this chapter sends you inside a Blume server facility using a Spy operative's active camouflage to ghost past security without triggering combat alerts. Completing all 404 chapter missions unlocks Nowt as a named DedSec ally with unique hacking passives that carry over between operatives.
The Spy Games chapter pivots to SIRS — London's domestic signals intelligence agency — which has been running an unauthorised mass surveillance program called CTOS-2. DedSec recruits a SIRS whistleblower to gain access to internal documentation proving SIRS collaborated with Zero-Day in the original bombings. The missions require social engineering rather than brute force: recruiting a Barrister or a Spy operative makes the chapter's evidence-gathering missions dramatically easier through dialogue shortcuts and restricted area clearance. The Whistleblower mission carries significant story weight — the intelligence gathered here directly informs the Zero-Day reveal in the finale and confirms Sabine's involvement as the true architect of DedSec's destruction.
The second Kelley chapter takes DedSec back into Mary Kelley's operation with a more targeted objective: locating and neutralising the dark-web infrastructure sustaining her organ trade. Detective Lau's surveillance data points to a luxury residence in Mayfair — the Sandstone Residence — where Kelley's evidence and communications are stored. The infiltration mission Bloody Mary Kelley requires entering through a rooftop drone access point and solving a node-rotation security puzzle to reach the compromised surveillance bug. Mary Kelley is not encountered in direct combat; rather, the mission ends with surveillance footage implicating her in the organ trade operation, triggering her arrest by Detective Lau and effectively dismantling Clan Kelley as an organisation.
The True Colours chapter returns to Albion with a narrower and more urgent objective: Albion's THEMIS autonomous drone program is about to receive a lethal-force authorisation upgrade, turning the city's surveillance drones into judge-and-executioner weapons. Mission Defanging the Flock sends DedSec to Tower Bridge to disable two communications encryptors feeding the THEMIS update. The bridge mission involves waves of incoming Albion combat drones — a Drone Expert operative can hack or betray drones mid-flight, turning Albion's own assets against their operators. Once the encryptors are destroyed, DedSec uploads a virus to the THEMIS network that locks Albion out of its drone fleet permanently.
The London Rising chapter delivers the game's central twist: Sabine Brandt, the DedSec cell leader who originally recruited the player's operatives to rebuild the organisation, is revealed as Zero-Day — the architect of the original London bombings and a secret Albion collaborator. Sabine seizes control of Bagley, the DedSec AI, and uses his network access to cripple London's digital infrastructure. The final mission Hard Reset tasks DedSec with physically accessing Sabine's server location to shut Bagley down safely and terminate Sabine's control interface. The resolution restores Bagley's autonomy and ends Albion's martial law over London, with DedSec's reputation restored across all eight boroughs.
⚔️ Boss Guides
Nigel Cass (Albion CEO — Prototype Combat Mech)
Attack Patterns
Nigel Cass conducts the entire first phase of his boss fight from inside an enormous prototype combat mech suspended from the Albion facility ceiling on a rotating gantry. The mech fires sustained machine-gun barrages that track your movement across the arena floor, and in the final phase it launches guided missiles with visible ground-targeting reticles. The weak-point panels on the hull are fully armoured and invulnerable until you complete each network bypass puzzle sequence, which temporarily opens them.
Strategy
The fight is structured around three bypass sequences. Each time you complete a bypass at the arena's floor-level consoles, the mech's panels open for approximately eight seconds — sprint into position during the bypass animation, not after, so you are already aiming when the panels expose. Stay behind the arena's fixed shield barriers during the machine-gun phase; the shields are indestructible and break line of sight completely. In the missile phase, the ground reticles appear half a second before impact — side-step rather than sprinting straight back. Once all three panel phases are complete and the mech is destroyed, Cass exits in light body armour. Four to six headshots from any operative weapon finishes the fight.
Skye Larsen (Blume Transhumanist — Into the Void)
Attack Patterns
Skye Larsen is the CEO of Blume whose consciousness has been uploaded into a persistent digital existence on life-support servers. The mission Into the Void takes DedSec inside Blume's Kelburn research facility, where Larsen's physical body exists in a medically induced vegetative state while her mind operates across the network. The encounter is not a combat boss fight in the conventional sense — the challenge is navigating heavy Blume security to reach her chamber and then making the binary moral choice at the terminal that determines her fate.
Strategy
Use a Construction Worker or Drone Expert to infiltrate the Kelburn facility through the maintenance access points on the building's east side, bypassing the two heavily guarded ground-floor checkpoints. Inside the server chamber you will find two terminals — the left terminal maintains her life support, the right disconnects it permanently. Your interaction with the left terminal triggers a dialogue sequence; the right terminal ends Larsen immediately without additional conditions. The decision affects your relationship with the 404 hacker Nowt but does not gate any further missions. Whichever you choose, depart through the rooftop drone access point to avoid the security reinforcement that spawns at the main entrance after the terminal interaction.
Albion THEMIS Drone Swarm — Defanging the Flock
Attack Patterns
The THEMIS drone swarm at Tower Bridge is less a single boss and more a sustained attrition encounter — Albion deploys continuous waves of combat drones from two landing pads on either end of the bridge while you upload a virus to the two communications encryptors. The drones prioritise aggressive flanking: they split into two groups, one engaging your operative directly while the other attempts to interrupt the upload at the encryptor. Albion security reinforcements arrive on foot via the bridge road every 90 seconds.
Strategy
Begin each encryptor upload immediately upon reaching the device and treat the drones as an interruption hazard rather than primary targets. A Drone Expert operative's Hijack ability converts each hacked THEMIS unit into a temporary ally that immediately attacks the nearest Albion target — four hacked drones can neutralise an entire wave of foot soldiers while you complete the upload unimpeded. If you lack a Drone Expert, position behind one of the bridge's stone turret pillars during upload — the pillar breaks drone targeting angles and forces them to reposition, buying several extra upload seconds. Destroy the two marked landing pads with a grenade to delay the second and third drone waves once the first encryptor is captured.
Mary Kelley — Bloody Mary Kelley (Clan Kelley Climax)
Attack Patterns
Mary Kelley does not engage DedSec directly in Bloody Mary Kelley. The mission is a high-stakes stealth infiltration of her Mayfair residence, the Sandstone Building, where a police surveillance bug planted by Detective Lau must be retrieved before Kelley's security sweeps it. Kelley herself is present in the building's inner sanctum guarded by three armed Kelley Enforcers with overlapping patrol routes. The threat is exposure — any guard who spots your operative triggers a full building lockdown that fails the evidence objective.
Strategy
Hijack one of the exterior camera drones hovering near the Sandstone Building's rooftop to scout the upper-floor vent access point before committing your operative. Enter through the top-floor window rather than any ground-level entry — ground approaches have four guard sightlines with no safe crossing point. Inside, the security system puzzle consists of floor and wall nodes that must be rotated to route two blue signal lines through each locked relay point in sequence. Work from the outer nodes inward; the central relay unlocks automatically once adjacent nodes are aligned. Retrieve the bug from the surveillance room and exit via the same rooftop drone shaft. Mary Kelley is subsequently arrested by Detective Lau based on the recovered footage.
Sabine Brandt — Zero-Day Final Confrontation (Hard Reset)
Attack Patterns
Sabine Brandt — revealed as Zero-Day and DedSec's founding betrayer — has seized Bagley's network architecture and is using it to generate cascading infrastructure failures across London. In the final mission Hard Reset, she directs waves of compromised DedSec-adjacent hackers and hired Albion holdouts against your operative while she maintains her digital stranglehold on Bagley from her server room. Severing her connection requires physically accessing and disconnecting server nodes while under sustained fire from her hired security, who prioritise suppressing your operative near the consoles.
Strategy
Bring your most combat-capable operative into the final mission — this is not a stealth scenario. The server room's approach corridor has three chokepoints; use cover-to-cover movement and throwable EMPs to disable the armed drones guarding each node console. Disconnect nodes in the sequence Bagley calls out — doing them out of order resets progress. Once the final node is severed, Sabine loses network control and confronts your operative directly in the server room antechamber. She carries a standard sidearm and has no special combat abilities — she is the game's most narratively significant fight but one of its least mechanically demanding. Three to four shots from any reliable weapon ends the confrontation and London's occupation simultaneously.