The Gorilla "Boss" of Gotham is a DC crime boss that an enemy of the Batman.
George "Boss" Dyke was a mobster of Gotham. He was sentenced to death by gas chamber and was executed inside the Gotham State prison.
Knowing that he would die, Dyke ordered some of his men to retrieve his corpse and present his dead body to the hated surgeon; Doctor Willard.
Performing dangerous surgery, Willard managed to transplant George’s brain into the body of a large gorilla, reviving Dyke as a gorilla with human brain. Because of this he gained great physical strength and endurance, though at a price. Dyke can no longer talk human language and is forced to communicate with his men by pen and paper.
Batman the Brave and the Bold
Gorilla Boss appears in the episode "Gorillas of our Mist". Unlike in the comics he can speak and is voiced by Deidrich Bader. He helps Gorilla Grodd and Monsieur Mallah take over Gotham City with an army of chimps. He mocks the heroine Vixen for not being as strong as him. In the end he and his allies are taken out by Batman, B'wana Beast, Vixen and Detective Chimp.