The story of Watch Dogs: Legion takes place in an open world, fictionalised representation of London, where a surveillance state has been established by a powerful corporation called Militech. Players take on the role of a member of DedSec, a hacking group that seeks to fight back against this oppressive regime. The game's narrative focuses on recruiting and controlling characters to complete missions and bring down the corporation.
The gameplay in Watch Dogs: Legion is action-packed and varied, with players able to explore the open world on foot or using vehicles. Each character has a unique background and abilities, allowing for different approaches to completing missions. The game also features cooperative multiplayer, where up to four players can work together to complete objectives.