Manhunter massacre

The Manhunter massacre of Frontier Space began when the Manhunters descended upon the worlds of what would become the Forgotten Zone, slaughtering every being they came across. Eventually, the Guardians of the Universe learned what was happening and decommissioned the Manhunters before they could move on to another sector. They were later replaced by the Green Lantern Corps in an event known as the Dominion War.