Doomsday Clock is part of the DC Rebirth initiative, and it continues the narrative that was established with the 2016 one-shot DC Universe: Rebirth Special, the 2017 crossover event “The Button” and other related stories. It is a follow-up to the 1986–1987 miniseries Watchmen by Alan Moore, Dave Gibbons and John Higgins, and it introduces that story’s characters into the DC Universe, alongside a few original characters created for the book. Although Dan DiDio (then DC’s co-publisher) confirmed that it is a sequel to that miniseries, Johns originally declined to characterize it as such, viewing it as a standalone story, saying, “It is something else. It is Watchmen colliding with the DC Universe.”
EHT Comics 