The Justice League has had an impressive roster of heroes throughout the years, but there are times when even the likes of Superman have to call in some extra help. While DC’s premier super-team may include the most powerful beings in existence, some threats are too big even for them to handle alone. Some threats require the League to open up their roster, like the one time they drafted the entire population of planet Earth to join the team.
The Justice League hasn’t always boasted such an impressive line-up. There was a time in the early '90s when the team was made up of a bunch of lesser-known heroes like Nuklon and Bloodwynd. All of that changed in 1997 with the arrival of JLA, Grant Morrison and Howard Porter’s bold revamp of the team. For the first time in decades, the Justice League was restored to the “Big Seven”: Superman, Batman, Wonder Woman, Green Lantern, the Flash, Aquaman and the Martian Manhunter. Morrison also quickly established the types of threats the League would routinely face—over the course of their run, the Justice League had to deal with a White Martian invasion, the armies of Heaven and Hell and reality-warping djinn from the 5th Dimension. Yet there was one threat above all the others, set up right from the beginning and hinted at throughout Morrison and Porter’s entire run.
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The Justice League’s ultimate challenge is Mageddon, an ancient war machine used by the Old Gods in the time before Darkseid ruled Apokalips. Placed in a gravity sinkhole at the edge of the universe, Mageddon eventually breaks free and embarks on a direct collision course with Earth. The world-ending weapon arrives in Morrison and Porter’s
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