Justice League: Crisis on Infinite Earths, Part Three description:

"Now fully revealed as the ultimate threat to existence, the Anti-Monitor wages an unrelenting attack on the surviving Earths that struggle for survival in a pocket universe," reads the synopsis for Justice League: Crisis on Infinite Earths - Part Three. "One-by-one, these worlds and all their inhabitants are vaporized. On the planets that remain, even time itself is shattered and heroes from the past join the Justice League and their rag-tag allies against the epitome of evil. But as they make their last stand, will the sacrifice of the superheroes be enough to save us all?