For several years from the late 1950s to the mid-1980s, particularly during the 1960s Silver Age of Comic Books era, DC Comics published various stories about their title characters which did not take place in their regular continuity. Most of these stories were labeled "Imaginary Stories" and featured alternate histories of characters. Although the majority of Imaginary Stories were published in various Superman comics, a few Imaginary Stories appeared in Batman comics and other DC publications.
The last official "Imaginary Story" ever published—"Whatever Happened to the Man of Tomorrow?"—was written by Alan Moore and appeared in Superman (Volume 1) #423 and Action Comics #583 (both September 1986). The Elseworlds series of self-contained stories are essentially Imaginary Stories under a newer label and a wider scope of possibilities.
The Crisis on Infinite Earths: The Compendium reclassified these stories as being on other Earths.
The following is a list of stories that were considered to be "Imaginary Stories" - but then, aren't they all?