The hypochondriac Argan wants his daughter to marry a doctor so he can save on his medical bills.

A group of young scientists conducts an experiment, putting themselves in the conditions of the people of the Stone Age. With the help of stone tools, they procure food and fire, and make themselves comfortable in nature.

Young clown Sasha is having trouble performing his act with his donkey Gena. After another failure, he decides to go on a journey with Gena. After traveling across the country, the friends return to their hometown and perform for the audience once again.