Zero Hour: Crisis in Time Collected

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All of reality comes under attack when a mysterious force of entropy begins slowly erasing time itself--making its way from both the past and future toward the present! As history itself unravels around them, the heroes of the world--including Superman, Batman, Wonder Woman, The Flash, The Justice Society and the Titans--scramble to fix the broken timestream. But even if they stop the true source of the chaos, the world they save will never be the same!