JUSTICE LEAGUE (REBIRTH) VOL 5 LEGACY TPB

In these stories from JUSTICE LEAGUE #26-31, the children of the Justice League come from the future to stop a terrible event that destroyed their world. There's only one problem: they came back too late. The cataclysm has already been set in motion, and now the children are forced to come up with a backup plan that involves doing the unthinkable.