"Reign of Doomsday" is a 2011 comic book crossover storyline published by DC Comics that ran through the Superman family of books, The Outsiders and The Justice League of America. The crossover involves Doomsday hunting down Steel, Superboy, Eradicator, and Cyborg Superman, the four main characters introduced in the wake of the controversial The Death of Superman storyline in 1992. Though the current iteration of the character was not present in the original The Death of Superman storyline, Supergirl appears in the crossover as well due to being part of the Justice League. The storyline draws its title from Reign of the Supermen, the immediate follow-up to The Death of Superman.

"The Death of Superman" is a crossover story event mostly featured in DC Comics' Superman-related publications. The crossover, which originated from editor Mike Carlin and writers Dan Jurgens, Roger Stern, Louise Simonson, Jerry Ordway, and Karl Kesel, began in December 1992 and lasted until October 1993. It was published in Superman, Action Comics, The Adventures of Superman, Superman: The Man of Steel, Justice League America, and Green Lantern. Since its initial publication, "The Death of Superman" has been reprinted in various formats and editions.