The Flash by Mark Waid

"Wally West gets a glimpse of the future after traveling through the time stream and doesn't like what he sees. Fearing for the one he loves and unable to approach maximum velocity without transforming into pure energy, Wally seeks a successor to the Flash mantle. Wally, Max Mercury, Johnny Quick and Jesse Quick take it upon themselves to train Impulse. But will the help of his friends be enough to prevent his horrible vision of the future from coming to fruition? Or will Wally have to make the ultimate sacrifice to change his destiny?"--Publisher's description.