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Batman, turned into an ape himself, was able to switch the emitter matrix on the device and everyone caught in the ray was turned human, instead. It would transform the residents of the Bahamas, West Indies, and Florida into apes. Grodd chose a 500 mile radius as his first target. With Batman, Grodd's one admitted equal, around, Grodd escalated his plans and went to owrk to generate a wave pulse to engulf the planet in his E-Ray. One such incident caught the alert of Batman and Plastic Man. To test his E-Ray, Grodd would lead a crack team to raid nearby luxuory yachts. He envisioned Dinosaur Island as the vanguard of a new civilation, a Gorilla Nation. Grodd built his headquarters on Dinosaur Island, hidden from time and ideal for the development of his experimental E-Ray, a device capable of transforming any life form into an ape. Time and time again, Grodd would employ advanced technology such as his Mind Control Module, capable of mind control.
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Instead of choosing peaceful isolation, Grodd sought to asert his rule over the entire planet but was met with resistance by super heroes like the Flash and Batman. Gorilla Grodd is a former citizen of Gorilla City, a hidden population of apes advanced by a stranded alien.
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