Hal Jordan and John Stewart have been off-planet since the events of Justice League: A New Green Lantern Corps member, Guy Gardner, are sent to Earth by the Guardians of the Universe after receiving a distress signal from the ancient and destroyed Manhunter. The Manhunter attacks them, and they don't know why, since, having been previously deactivated, the Manhunter androids have gained consciousness and want revenge on the Guardians of the Universe, who deactivated them and replaced them with the Green Lanterns. Guy and the new member will have to work together to find a way to stop the Manhunter and his plans.