The hooligan dog Polkan, finding himself in trouble, understands how bad it is when there are no friends and therefore no one comes to his birthday.

Monkey Zhakonia is an indefatigable inventor and prankster. It is he who constantly inspires two naive and somewhat awkward bear cubs, Tyapa and Lyapa, who completely trust him and always help him, because they are sure that "Zhakonia knows everything," as he himself says. However, Zhakonia's pranks usually end with the "know-it-all" and the bear cubs getting into trouble. Fortunately, they have another friend, a boy named Televichok, who is very well-read and talented. He always comes to their rescue and helps them out of awkward situations, explaining how to do things correctly.