DC Super Stars #14 (1977)

Green Lantern is on Oa where the Guardians tell him that they (jointly) are responsible for unleashing a menace on Earth. To demonstrate this, they show a "video" of Green Lantern's mission to Calor (originally from Green Lantern #1: Planet of Doomed Men). In that adventure Green Lantern fought the Dryg. Recognizing the creature came from a volcano, Green Lantern traps it by creating Liquid Oxygen and freezing it. In this tale, however, the adventure was watched by a sentient gorilla (later revealed as Grodd), who returns to Gorilla City. Apparently on this planet, man evolved into gorillas. Gorilla City was endangered by the volcanic activity and considered themselves doomed. But Grodd informs Solovar that, if all the gorillas work together, they can tap into the ring's energy and use it to transport Gorilla City to Earth. In transit Grodd demands to be made leader because he thought of the city-saving solution. Denied, Grodd attacked Solovar and during the turmoil, the gorillas lost control of the ring's power as planetoids began to hit the city. One took down Grodd and Solovar led his people to refocus their minds resuming the ring's protective power. Once relocated on Earth, Solovar vows that they should claim their origins were from Earth (fearing a return to Calor), but Grodd was still able to siphon Green Lantern's ring's energy to make good his escape. Grodd then sends a mental summons bringing Green Lantern to him where Grodd attacks. Grodd is unable to remove the ring but can still use the energy. He creates a giant duplicate with which he attacks Gorilla City but Green Lantern stops him by encasing him in ice as he did the Dryg. Then Solivar uses his own mental powers to make Green Lantern forget everything. The Guardians then admit they told Green Lantern the truth since Gorilla City is now more commonly known.