DC Comics
During the early 1990s the comic book industry experienced a boom in sales, with books tied to DC’s massive The Death of Superman crossover event selling millions of copies. Such growth proved unsustainable, as sales soon declined to a fraction of their previous levels. Less than a decade after Crisis, DC rebooted its line again in the Zero Hour (1994) crossover, and in 1999 writer Mark Waid attempted to address the DC universe’s lingering continuity issues by introducing Hypertime, a concept that, in essence, restored the pre-Crisis multiverse. In 2010 the company began to produce digital editions of its comics, and the following year, in an attempt to boost sales, DC Comics again rebooted its fictional continuity with a series of comics collectively referred to as the “New 52.” Another reboot followed in 2016 with the Rebirth event, and in 2021 DC rebooted its entire line yet again during the Infinite Frontier crossover.