2029 Astronaut Leo Davidson on a giant space station teaches monkeys how to control aircraft. Suddenly, the experiment gets out of control, one of his students instantly loses control of the aircraft and takes him into one of the space-time tunnels. Leo immediately rushes to the rescue of chimpanzees, but he suffers the same fate. After passing through this tunnel, Leo makes a jump in time and finds himself on an unknown planet, ruled by the civilization of militant monkeys, which turned all people into their slaves. Leo is captured by monkeys and is now trying with all his might to defend people's rights to freedom. But to resist the evil and armed gorillas will be quite difficult.