: In this timeline, Wally West has become a "war general," sending speedster copies of himself on suicide missions to defeat the villain Eclipso.
: This issue is widely praised for the dynamic, kinetic artwork of Francis Manapul, who used massive splash pages to capture the feeling of super-speed. The Modern "Army of Flashes" Flash 21
: The issue features a shocking confrontation with Eobard Thawne, the Reverse-Flash, whose mysterious death sets the stakes for a reality-shattering adventure. : In this timeline, Wally West has become
In more recent stories (2025), The Flash #21 has explored even weirder cosmic horror. In more recent stories (2025), The Flash #21
One of the most famous versions of The Flash #21 was published in 2017 as the second part of " The Button ". This storyline directly connected the world of the Flash to the mysterious Watchmen universe.