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Justice League of America #21 features the legendary return of the Justice Society of America after 12 years, in a classic "Crisis on Earth-One!" storyline. This pivotal issue brings together the Justice League and Justice Society in a landmark crossover event, showcasing iconic heroes like Green Lantern, Flash, and Wonder Woman. The story explores the multiverse concept, with heroes from different Earths joining forces to face a common threat. This issue is significant in DC Comics history for establishing the multiverse narrative and reuniting two generations of superheroes.
Keywords: Justice League Justice Society DC Comics Crisis on Earth-One 1963 multiverse Green Lantern Flash Wonder Woman superhero crossover