DC Universe contains DC superheroes that disappear in American comic books.
 Although retcons were used as a way to explain apparent inconsistencies in stories written, editors at DC came to consider the varied continuity of multiple Earths too difficult to keep track of, and feared that it was an obstacle to accessibility for new readers
 By the end of the storyline Superman Reborn, the timelines of New Earth and Prime Earth have realigned into one single reality

