Superman and Martian Manhunter are abducted by extraterrestrial slave traders and are sold to a planet of the despotic ruler Mongul where the population spends its time watching aliens in mortal combat in an enormous colosseum. Green Lantern and Hawkgirl set out to rescue them.

Green Lantern and the Flash uncover a plot by Gorilla Grodd to destroy Gorilla City, a hidden city of hyperintelligent talking gorillas in Africa. Grodd has a device that allows him to control the minds of others, and uses stolen gorilla technology to steal all of Central City and put its inhabitants under his control. Locked inside the force field-shielded city, Flash and Green Lantern work together with Solovar, Gorilla City's chief of security, to destroy the enemy from within before Grodd carries out his revenge on Gorilla City.