Warning: contains spoilers for Justice League: Road to Dark Crisis #1!
DC's Flash is a legacy superhero, meaning multiple characters have inherited the mantle as previous holders die in the line of duty — which is why resurrecting Barry Allen practically ruined Wally West. Easily the most famous Flash of all time, Barry Allen memorably perished in 1985's Crisis on Infinite Earths crossover and remained dead for over 20 years (an eternity in comics). Unfortunately, his resurrection in 2008 doomed the current Flash — and in Justice League: Road to Dark Crisis #1, DC admits it.
Barry Allen wasn't the first Flash, but he was the most famous. Taking over from the Golden Age Flash Jay Garrick, Allen had a completely different origin and backstory that cemented his position as a popular superhero in the science fiction-based Silver Age of Comics. Flash's death in 1985 was intended to be permanent; he died saving the entire universe and his successor, Wally West, was the de facto Flash of the 90s and 2000s — until 2008's Final Crisis, in which Barry Allen was miraculously resurrected (he was inside the Speed Force and was never technically dead).
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Alive once more, Barry began to pull focus from Wally in multiple stories in comics (and especially outside of comics; Allen is the star of both the Flash 2014 television show and the DCEU film series). Justice League: Road to Dark Crisis #1, written by Joshua Williamson and Dan Jurgens with art by Norm Rapmund, admits as much in the aftermath of the Death of the Justice League event. The entire league is missing and presumed dead — but many heroes have been dead before, and Nightwing discusses the concept with Jonathan
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