The story of the Assassin's Creed games primarily revolve around the rivalry between two ancient secret societies: the Brotherhood of Assassins and the Templar Order, and their indirect relation to an ancient species predating humanity, whose society, along with much of Earth's biosphere, was destroyed by a massive solar storm.
The games' real-world chronological setting begins in the year 2012, and features Desmond Miles, a bartender who is a descendant of several lines of prominent Assassins; though raised as an Assassin, he left his nomadic family to seek out a more common lifestyle.
Relations to Watch Dogs
Many references to the series are present in the Watch Dogs franchise. These are also known as easter eggs.
- A row of computer game discs are visible on a desk during one of the game's scenes, and two of the games are from the Far Cry and Assassin's Creed series.
- The games can be found in the pawn shops.
- The original Assassin's Creed can be found on Jackson's bookshelf.
- In Assassin's Creed IV: Black Flag, while hacking Abstergo computers, one can find a document about Blume Corporation.
- In Assassin's Creed IV: Black Flag, Abstergo employees can be heard thinking about moving to Chicago and working for Blume.
- In Assassin's Creed IV: Black Flag, Abstergo employees can be heard discussing looking into a security company in Chicago during phone calls. This is most likely a reference to Blume.
- Assassin's Creed IV: Black Flag takes place around the same time as Watch_Dogs does (2013).
- During the Criminal Convoy mission Requiescat In Pace, Aiden is tasked with taking down Olivier Garneau, the chief creative officer of Abstergo Entertainment. Garneau was a character in Black Flag who disappeared after going to Chicago.
- In ctOS_SENTINEL100326_Leak, a father watches his son play a video game, and asks why "the assassin [is] talking to the guy he just killed." In the Assassin's Creed series, the protagonist will share a few final words with their victim before they die.
- Some of the civilians have references to Abstergo Industries in their profiles.
- At newsstands, some magazines by the company NextTECH can be seen with the title "10 Best Games of All Time" and shows Connor Kenway, the protagonist of Assassin's Creed III, standing on a roof.
- A pedestrian phone call can be heard which consists of a woman saying the names of historical figures and a man replying with either "Assassin" or "Templar", indicating which fictional order from the series he believed that person to have been a member of.
- In Watch Dogs: Legion, one of the potential profiler entries for London residents is "Recently searched: Jacob Frye descendants". Jacob Frye was a protagonist in the game Assassin's Creed: Syndicate.
- In Watch Dogs: Legion, the stock market portfolios displayed in certain locations include a listing for Abstergo Industries from Assassin's Creed.