Mitya has figured out how to return Gusar to the past without breaking the space-time continuum. But to do this, he and Katya need to get into Ratford's hotel room, and Rylsky needs to stay at home.

Season finale! The Zhuravlevs are preparing for the wedding of Nastya and Grigory. Unexpectedly, Ratford and Dog from the new reality appear on their doorstep, forcing Mitya to move an enemy from the past. Hussar and Nastya need to figure out how to save their friends, and at the same time the whole world.