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Barry Allen, in the form of the Flash, is imbued with the amazing Power of Speed, which allows him to move, act and think with extraordinary speed. But he doesn't just use the Speed Force, he creates it with every step he takes. Like a dynamo, he is the power that moves time forward.

But now there is someone who wants to turn everything around.

A lightning-fast killer is prowling the streets of Central City in search of everyone touched by the Speed Force. This means that everyone who matters to the Flash has become a potential target. With the inverted Flash symbol on his chest, he absorbs more and more power with each successive victim. His goal is to reverse the course of time that sustains the Flash.

Who is the Upside Down Flash? What is his terrible connection to the Speed Force and Barry Allen? And will the Flash be able to put an end to his madness before it's too late?