chunk: When Caesar reaches adolescence and sees a dog on a leash like his own, he questions his identity and learns of his origins from Will. Meanwhile, Charles's condition returns as his Alzheimer's becomes resistant to ALZ-112. Caesar injures a neighbor, Douglas Hunsiker, while defending a confused Charles. As a result, he is placed in a primate shelter where he is treated cruelly by the other chimps and the chief guard, Dodge Landon. Caesar learns how to unlock his cage, gaining free access to the common area. With the assistance of a gorilla named Buck, he confronts the sanctuary's alpha chimp named Rocket and claims that position. Meanwhile, Jacobs clears development of a more powerful, gaseous version of the drug â ALZ-113 â when Will tells him it can not only heal brain diseases but also improve intelligence. Will takes the drug home to try to save his father, but Charles declines further treatment and dies overnight.