The "fiksiki" are small, kind men who live in machines and instruments and take care of technique. Fiksiki hide from men: there are very few lucky people in the world who communicate with them. Professor Chudakov's laboratory is home to the fiksiki school, known only to a little boy named DimDimytch and his girlfriend Katia. But one day, elusive little creatures burst into it. They spy on fiksiki and threaten their secret. Who are these strange robots-kraboti, what do they want and who is behind them? It turns out that Professor Chudakov has had someone for a long time who does not wish him good, and who summons the professor in a duel to settle the old accounts! The new friends, Mega and Alt, will come to the aid of our fiksiki and all will find themselves immersed in a whirlwind of adventures.