Superman: Whatever Happened to the Man of Tomorrow? reference to one of the nicknames of Superman as the "Man of Tomorrow", and was later again used in the title of another Superman . The comic book, "Action Comics" #1, published in April 1938 by "National Allied Publications" (later renamed DC Comics), marked the first publication of the character of Superman created by Jerry Siegel and Joe Shuster. The comic quickly became a success, and its editor soon realized that it was because of the popularity of the character. In an unprecedented move at the time, National Allied Publications introduced a second comic book, "Superman", exclusively featuring the popular
The Death of Superman arc references Siegel and Shuster's first Superman story, "The Reign of the Superman". It crosses into the larger DC Universe, with "Green Lantern" #46 (October 1993) featuring a tie-in story. Despite the gap between the releases of "Funeral for a Friend" and "Reign of the Supermen!", no time passed within the continuity of the comics. "The Death of Superman" concluded in October 1993 with "The Adventures of Superman" #505, in which Superman returns to Metropolis. Doomsday emerges from an underground bunker and encounters the Justice League International. He easily defeats them, but Superman arrives and the two fight across America.