Planet of the Apes

In 2029, aboard the United States Air Force space station Oberon, Leo Davidson works closely with primates who are trained for space missions. His favorite simian co-worker is a chimpanzee named Pericles. With a deadly electromagnetic storm approaching the station, a small space pod piloted by Pericles is used to probe the storm. Pericles's pod heads into the storm and disappears. Leo takes a second pod and pursues Pericles. Entering the storm, Leo loses contact with the Oberon and, in 5021 A.D., crashes on a planet called Ashlar. He learns that the world is ruled by humanoid apes who speak English, use domesticated horses for transportation, and treat human beings as slaves.