Two representatives of an extraterrestrial civilization are sent to Earth to find the missing son of the Emperor and help him complete a secret mission. The aliens mimic humans and pose as an ordinary couple, Anton and Marina. In order not to attract too much attention, they try to do all the same things as others: go to work, communicate with friends and colleagues, engage in everyday life. At first, the aliens have a very difficult time. However, they gradually get used to it, and Anton sees more and more advantages in earthly life and does not want to return to his native planet.

The brownie escapes from the captivity of Baba Yaga in her magical world, and ends up in the apartment of the girl Natasha and her parents. Kuzya needs to find his magic chest that grants wishes. Both Natasha and the local grumpy brownie Nafanya help him in this. It turns out that Kuzya himself gave the chest to Andrey, Natasha's dad, many years ago. It would seem that the goal is already close, but in search of both Kuzya and the chest, Baba Yaga entered our world, and she has her own insidious plans.