Koba

Koba is the true antagonist of Rise of the Planet of the Apes.

He is played by Christopher Gordon.

Rise of the Planet of the Apes
Koba is a aggressive, violent, sadistic Bonobo chimpanzee, considered a dark counterpart to the main protagonist, Caesar, for whom he seemed to respect.

Koba was a test subject for Gen-Sys and according to the chimp handler Robert Franlkin, he's been tested on for years, which may explain his scar, during that time he had developed a hatred for humans, and Steven Jacobs.

Koba was a test subject for the ALZ-113 drug, which at a surprising level increased his intelligence to the point when he could write Jacobs, which was a threat to his opressor. During one of these tests, he attacked Franklin, knocking off his mask and exposing him to the ALZ-113. It was soon proven that while to the apes it inproved their thoughts, to humans it was deadly, exposing the virus to the rest of the world and killing off most of the population.

Koba was soon freed by Caesar and joined in the rebellion to find haven in Muir Woods Park and was ordered by Caesar to attack the bridges high wire supports. During the battle a comrade and friend of Caesar's was killed by Jacobs, who was now dangling from the wreckage of a helicopter over the water. Not willing to kill him but also not caring for him, Ceasar left Jacobs in the hands of Koba. He begged for mercy, but without hestitation Koba pushed Jacobs off the bridge.

He was later seen in Muir Woods Park, where Will had come to get Caesar. Koba attacked him but was stopped by Ceasar. Out of fear he ran off.

Trivia
Director Rupert Wyatt said in an interview that Koba would return in the sequels, if so he would possibly be the main antagonist and have evolved to the point when like Caesar, he can talk.

Koba was a nick-name for Joseph Stalin before the revolution.

Koba is considered the true antagonist due to him being a darker version of the hero Caesar and being that he is directly responsable for the ALZ-113 pandemic.