After the events of the first film and Justice League II, Hal and John are defending Sector 2814 as they should be. A new threat on Earth is rising with that being the powerful telepathic, Hector Hammond. Hal is stuck dealing with a crisis on planet Ungara, so John is all on his own dealing with this new threat. It's because of this that the Guardians award a new Green Lantern of Sector 2814 to help deal with the threat.