This page may include spoilers about the Watch Dogs: Legion plot that you may not have discovered yet. Read at your own risk.
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Zero Day is a terrorist and hacker group in direct competition with the prominent hacker group DedSec and is accredited with framing DedSec for a major terrorist attack shown in the prologue of Watch Dogs: Legion. This attack lead to the rise of both Albion and Clan Kelley, along with the rise of corruption and oppression in London.
Their motive seems to be the destruction of London, however the reasons for this are somewhat unclear. It is believed by some that Zero Day are actually rogue SIRS agents. Towards the end of the campaign, Zero Day's real leader is found out to be Sabine Brandt.
- Zero Day is the main antagonistic faction of the Watch Dogs: Legion campaign, despite not possessing any territory or having any known members.