In the year of 3978, on November 25, several earthlings find themselves on a distant planet, after their spacecraft crashed. They did not even know about its existence and were very amazed by the fact that it is very similar to Earth. Soon they become aware that the planet is inhabited by intelligent monkeys and people who have degraded to the animal state. After some time, the monkeys capture the team and begin to torture each of them. At one point, one team member escapes, along with a pretty girl-chimpanzee who tells him about the worst secrets of this planet. Will they manage to escape from prosecution and save their lives?..