A chimpanzee prefect uses gladiatorial games to keep his human villagers pacified. However, the son of the undefeated champion won't fight... and the astronauts turn to him for help when the prefect acquires the disk.

After Galen breaks his leg, the fugitives are forced to take refuge with a family of poor ape farmers. The eldest son's cow is pregnant... and if it fails to deliver a bull, he'll hold the humans to blame and kill them.