Zero Hour: Crisis in Time #[nn]

This 1994 DC collection assembles the crossover event that sought to streamline the company's convoluted continuity following the 'Crisis on Infinite Earths.' The story, spanning the core limited series and tie-in issues, follows a temporal villain named Extant who threatens to unravel all of history, forcing the Justice Society, Justice League, and other heroes to confront a collapsing timeline. It serves as a direct sequel to 'Armageddon 2001' and a precursor to the 'DC One Million' and 'Final Night' events, ultimately rebooting the Legion of Super-Heroes and several other titles.