

With the help of Supergirl, they discover that they are part of a trial orchestrated by The Monitor, a mysterious cosmic being who seeks to prepare them for a coming cataclysm. One day, Oliver and Barry inexplicably find themselves living each other's lives. This major crossover was notable in that it served as a prelude to a bigger event down the line. The initial mystery surrounding Barry's supposed descent into madness was also quite engaging, even if the overall story dragged at points and certain elements felt all-too-familiar. While the Flash was very much the central focus, various characters from across the CWVerse made welcome appearances throughout, and Despero was presented as a threatening and complex new antagonist for the Scarlet Speedster. The alien Despero, played wonderfully by Tony Curran, appears from the future to kill Barry as he apparently loses his mind at some point and brings about the world's destruction.
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RELATED: 'Crisis On Infinite Earths': How To Watch The Epic CW-Verse Event In Chronological Order While the title implied high stakes, this was more of a personal story for Barry Allen.


Not only was it the first multi-episode crossover following the massive Crisis on Infinite Earths event, it was also the first one done without Oliver Queen after the conclusion of Arrow, the CWVerse's progenitor. This special had a monumental challenge before it.
