"Whatever Happened to the Man of Tomorrow?" is a 1986 American comic book story published by DC Comics, featuring the superhero Superman. Written by British author Alan Moore with help from long-time Superman editor Julius Schwartz, the story was published in two parts, beginning in Superman #423 and ending in Action Comics #583, both published in September 1986. The story was drawn by long-time artist Curt Swan in one of his final major contributions to the Superman titles and was inked by George Pérez in the issue of Superman and Kurt Schaffenberger in the issue of Action Comics. The story was an imaginary story which told the final tale of the Silver Age Superman and his long history, which was being rebooted following the events of Crisis on Infinite Earths, before his modern introduction in the John Byrne series, The Man of Steel.

Alan Moore is an English author known primarily for his work in comic books including Watchmen, V for Vendetta, The Ballad of Halo Jones, Swamp Thing, Batman: The Killing Joke, and From Hell. He is widely recognised among his peers and critics as one of the best comic book writers in the English language. Moore has occasionally used such pseudonyms as Curt Vile, Jill de Ray, Brilburn Logue, and Translucia Baboon; also, reprints of some of his work have been credited to The Original Writer when Moore requested that his name be removed.