A young shepherd Yanka tries to save his beloved girl Marinka with the help of his magic fife.

The artificial brain Sig, created under the guidance of Professor Yavorovsky, disappeared in one of the research institutes. Meanwhile, strange phenomena are happening in the city: all the zoo animals have been released from their cages, and the books in the city's book depository have been mixed up. And Whitefish, having mastered the accumulated experience of science and fiction accumulated by mankind, creates an artificial organism himself, returns to the professor and is soon sent to the constellation Gemini.

It's time for the reckless guy Simion Cook to join the army. Having joined the airborne troops under the command of petty officer Petro Golovko, who is not indifferent to music, who organizes the vocal trio "Sineva", named after the initial letters of its participants: Moldovan Simeon, Armenian Nerses and Russian Vasily. And now the day has come when a new musical director, who turned out to be a charming girl Sasha, should arrive at the military unit. Who would have guessed that after the service, Simion would return home with a pretty bride...