In October of 1994, all of the existing mainstream DC Comics titles released a special "0" issue to coincide with the Zero Hour crossover event. The purpose of the "0" issue was to reveal a previously unknown aspect of the title character's background. DC Titles under the Vertigo imprint were largely unaffected by Zero Hour and thus, no "0" issue specials were published for them.
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The events from this issue or series are related to Zero Hour: A Crisis in Time!, or its successor event Zero Month. This template will automatically categorize articles that include it into the Zero Hour category.