When comic book artist Alex Ross was working on Marvels, published in 1994, he decided to create a similar "grand opus" about characters from DC Comics. Ross wrote a 40-page handwritten outline of what would become Kingdom Come and pitched the idea to James Robinson as a project similar in scope to Watchmen (1986–1987) and Alan Moore's infamous "lost work" Twilight of the Superheroes. Ultimately, Ross teamed with writer Mark Waid, who was recommended by DC editors due to his strong familiarity with the history of DC superheroes.