Trapped in a pocket universe, surviving Earths face annihilation by the Anti-Monitor. Time shatters, bringing past heroes to aid Justice League against the epitome of evil. Their sacrifice may lead to victory.

"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?—Jakkepoes