The most game-changing story Flash has ever been a part of makes so much more of an impact when its oft-overlooked prologue is taken into account. Flash's underrated enemy, Captain Boomerang, played a key part in setting up Flashpoint, showing how the smallest actions can have the biggest consequences.
The 2011 event comic Flashpoint was possibly one of, if not the biggest shakeup to DC's status quo. Not only did it present a world that was much more dreary and twisted than the main universe, the story ended with the Post-Crisis DCU being rebooted, ushering in the era of DC's New 52. The dramatic shift from what readers were familiar with was shocking enough, but it stung all the more knowing that the the real perpetrator behind the events of Flashpoint was actually Barry Allen. Though all the Flash wanted to do was save his mother, his choices wound up having a huge impact on the entire DCU.
Related: Marvel's Version of Flashpoint Came Way Before DC's, & Was Much Darker
Interestingly enough, the idea of seemingly innocuous actions having severe ramifications was actually explored just a few months earlier in Geoff Johns' and Scott Kolins' The Flash #7. Barry's most outrageous Rogue Captain Boomerang breaks into Iron Heights coming to seek the aid of the Reverse Flash. Both villains were resurrected at the end of the Blackest Night event and Boomerang is desperate to know why he got a second chance. He destroys every safety precaution the jail has taken to keep Thawne sedated, awakening the extremely dangerous speedster. Boomerang offers to free the Reverse Flash if the villain, who hails from the 25th century, tells Boomerang what the future holds for him. Thawne tells the Rogue that the only thing that he'll ever be
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