What began with Alan Moore and Dave Gibbons’ landmark graphic novel, Watchmen (1987) is no longer a single story, but rather a cross-platform, multi-media franchise, including a role-playing game and video game, a motion comic, a Zack Snyder movie, and a series of comic book prequels and sequels, as well as a prestige HBO TV series. Will Brooker explores the way that Watchmen expanded over time from the mid-1980s to the present day, drawing on theories of adaptation, intertextuality and deconstruction to argue that each addition subtly changes our understanding of the original. Does it...