A spaceship from the twentieth century flew at the speed of light for 6 months, which is equivalent to 700 years, and the captain Taylor (Charlton Heston) set the automatic flight state, and finally crashed on a strange planet in 3978 AD. Taylor and two survivors discovered that the planet was on a par with Earth's environment, and that there were humans who could not speak and live by gathering. It turns out that the owner of this planet is an ape, and humans are nothing more than beasts for them to hunt and study, Dr. Ape Kira (Kim Hunter) and her boyfriend Cornelly are conducting research on human behavior and ape history respectively, Taylor, who is injured in the throat, temporarily loses the ability to speak, but his communication behavior quickly attracts Kira's attention, causing controversy in the die-hard ape academic community. Taylor, who had been trying to fight for his freedom, soon discovered the truth about the planet of the apes......