Crisis on Infinite Earths is an American comic book crossover storyline published by DC Comics from 1985 to 1986, consisting of an eponymous 12-issue, limited series comic book and a number of tie-in books. It was produced by DC Comics to simplify its then-50-year-old continuity. The series was written by Marv Wolfman and illustrated by George Pérez (pencils and layouts), Mike DeCarlo, Dick Giordano and Jerry Ordway (inking and embellishing). The series removed the multiverse concept from the fictional DC Universe, depicting the death of long-standing characters Supergirl and the Barry Allen incarnation of the Flash. Continuity in the DC Universe is divided into pre-Crisis and post-Crisis periods. The Flash was later reborn.