The animated film tells about a stupid boastful little mouse who liked to scold natural phenomena. Once a mouse was kidnapped by a snowy owl, but he was saved by a hunter with a good heart, despite the fact that the mouse had once offended him.

This episode of the TV almanac dramatized fragments of A. Tolstoy's science fiction novel "Aelita", the stories of Kir Bulychev "The Snow Maiden" and Eric Frank Russell's "I Testify".