A rare breed of monkey died at the zoo. And it was on the eve of the arrival of its owner, Mrs. Parkins. The management, knowing about the stunning resemblance of the "dead woman" to the janitor Khrapunkov, decides on a risky experiment: to replace the gorilla with its humanoid counterpart.

A young, intelligent and lucky guy, nicknamed Favorite, which stuck to him during his student years, is interested in karate. The local mafia notices him and begins to promote him to the People's Deputies of the RSFSR. A girl he meets after a long separation helps the hero understand this situation. The fight for her honor develops into an open battle with a criminal group, from which the guy emerges with honor.