The DC Comics’ Flashpoint event is one of the Flash’s most well-known storylines, one which opened up the multiverse to a number of new possibilities, but many fans may not know that Marvel Comics actually had its very own ‘Flashpoint’ first, and it was much darker.
DC Comics' Flashpoint by Geoff Johns and Andy Kubert chronicled the events of the fallout caused by the Flash going back in time to save his mother's life. While doing what he thought was right, the Flash rewrote the landscape of DC continuity (as he might do again in the DCEU), including Bruce Wayne being killed and his father being that universe's Batman, to a war raging between Aquaman and Wonder Woman that shook the world to its core. While the world he created seemed bad, the Flash was able to fix his mistake by going back in time and undoing what he had done, setting the DC Universe back on course.
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In X-Men #53 by Mark Waid and Andy Kubert, Jean Grey is whisked away to the Astral Plane by the villain who would later be revealed as Onslaught. The dark manifestation of Charles Xavier and Magneto’s merged subconscious tells Jean that he needs her to accomplish his goals, saying, “Call me a sympathizer. A kindred spirit of the Homo Superior race. Someone anxious to prepare you for your role as a key player in the days soon to come… the days in which human-mutant relations will finally… after decades of misdeeds and mistrust… reach their ultimate flashpoint”. While Jean Grey turns down his offer, Onslaught is still able to bring the world to its knees like few villains have done before. In fact, his impact is so great that Onslaught’s attack leads to the disappearance of the Avengers, one
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