Zero Hour: Crisis in Time #4 Var (1994) (High Grade)

Readers of Zero Hour should read this issue first, then work their way backward to number zero. 

The universe is being destroyed by an all-consuming force that is working its way from the distant future to the past. Wally West Flash, like Barry Allen before him, tries to stop the crisis, but vanishes in the process. In addition, anomalies, such as Barbara Gordon appearing as Batgirl (despite the fact that Joker paralyzed her years before), begin popping up all over the world.