Quick recap
A wave of antimatter starts erasing entire universes across the multiverse. The mysterious Monitor and his aide, Harbinger, gather heroes and villains from many Earths to fight back. Behind the destruction is the Anti-Monitor, who wants a universe made only of antimatter. The war takes a heavy toll: Supergirl dies fighting the Anti-Monitor, and Barry Allen's Flash sacrifices himself to destroy the cannon threatening what's left of reality. The surviving Earths are merged into one. In the final battle, the Earth-2 Superman, Superboy-Prime and Alexander Luthor defeat the Anti-Monitor and leave for a paradise outside time. A single Earth remains, with a new history.
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