In 1985, DC Comics decided its 50 years of continuity and numerous alternative Earths had become too messy and was in need of new blank slate. DC penned one of the first major comic book crossovers that incorporated almost every DC title and character ever published by the company. The series ended with multiple Earths being erased and merging into to one unified Earth. Following this, Batman, Superman and Wonder Woman were given new leases of life thanks to big name creators such as John Byrne, Frank Miller and George Perez that redefined the elderly heroes for a new generation.