Musical film in three episodes. A robot named Elektronic escapes from Professor Gromov's laboratory. Elektronik bears a striking resemblance to Sergei Syroezhkin, whose magazine cover photo served as a model for Gromov to build Elektronik. Sergei meets his mechanical double by chance and convinces him to take his place at school and at home. The plan works, because no one distinguishes between the two. To the great joy of the teachers, the boy, who had suddenly become gifted, showed himself to be brilliant in everything: mathematics, physical education and sports, drawing, singing... Just as fooled as the teachers, Sergei's parents were delighted to see their son's remarkable progress. However, Sergei ends up understanding that the robot is stealing his friends, the love of his parents and, all in all, making him useless. At the same time, somewhere abroad, a gang, with a certain Stump at its head, decides to kidnap Elektronik. The bandits want to commit the “crime of the century” thanks to the robot’s supernatural abilities...