Expanding the DC K.O. blockbuster saga through the lens of the Speed Force, the Flash Family becomes the linchpin connecting timelines as battles rage across worldsrevealing how the fight for the Heart of Apokolips reshapes the flow of time itself.Legendary Flash writer Mark Waid returns to the character he co-createdImpulseas the impetuous speedster decides he can stop the havoc of DC K.O. single-handed!But the young heros Impulsepoint will do much more harm than good, and now the Flash must stop Impulses race through time before he wipes out everything! Plus Darkseids Absolute Legion chases the speedsters to Flash Barry Allens origin moment, and Flash Jay Garrick battles Green Lantern Guy Gardner in a K.O. bout for the ages in this collection of The Flash #26-30! (Note: This is Volume 5 of the ongoing The Flash series collections.)