Xiao Gang, a naughty primitive man, lives in the wild with his parents. By chance, he and the lovely gorilla became inseparable friends. In order to make Xiaogang a real primitive man, the family went through all kinds of hardships. They explored the Arctic, fought fierce mammoths, encountered flying saucers, traveled to hell and saved mermaids. At the same time, the family also tried farming and even moved to the sky, but in the end they felt that the primitive life was the most suitable for them. With the help of the forest warrior gorilla, the difficulties and obstacles were defeated one by one, and the naughty Xiaogang also grew into a real "mountain hunter", which was favored by the lovely Po.