Two Earths! Parallel worlds, separated by both time and space, each unaware of the existence of the other. A generation of heroes arises on each planet. Although strikingly alike, they remain distinctly unique. The two worlds are forever linked when the scarlet speedster called the Flash pierces the dimensional veil and encounters his amazing counterpart - an older, wiser Flash. This incredible discovery changes the course of history! Contains: · Green Lantern (Volume 2) #40 · Showcase #55-#56 · The Brave and the Bold #61 · The Flash #123, #129, #137, #151 · Spectre #7