Ape City is in a panic. Word has spread of the capture of a talking human (Hal) and his bizarre alien companion (Sinestro). What's worse, a group of strange, scarred humans ("Mutants”) are spotted in The Forbidden Zone, being led by a strange-acting Cornelius, who's wearing a ring - a ring Sinestro has long been searching for.
The battle has infected Ape City. Cornelius' army of empowered mutants and apes lay waste to Grodd's Gorilla Army and Red Lanterns. This world's only hope lies with Hal Jordan and Sinestro, who must work together to save Cornelius from the corruption of the Universal Ring.