Conquest of the Planet of the Apes is a 1972 American science fiction film directed by J. Lee Thompson and written by Paul Dehn. The film is the sequel to Escape from the Planet of the Apes (1971) and the fourth installment in the Planet of the Apes original film series. It stars Roddy McDowall, Don Murray, Ricardo Montalbán, Natalie Trundy, and Hari Rhodes. In the film, set in a world that has embraced ape slavery, Caesar (McDowall), the son of the late simians Cornelius and Zira, surfaces out of hiding from the authorities and prepares for a rebellion against humanity.

Plot

Following a North American pandemic from a space-borne disease that wiped out all dogs and cats in 1983, the government has become a series of Schutzstaffel-patterned police states that took chimpanzees, gorillas, and orangutans as pets before establishing a culture based on ape slave labor. These events were foretold in 1973 as testimony by two chimpanzee scientists who came from the distant future, Cornelius and Zira, before they were killed. Widely believed to be dead, their baby was secretly raised by the circus owner Armando as a young horseback rider. In 1991, now fully grown and named Caesar, the ape is brought to one of the cities to distribute flyers for Armando's circus. During their trip, Armando advises Caesar not to speak in public for fear of his life.