The dentist of the provincial town of Upper Yamki made an unexpected scientific discovery by finding the thirty-third tooth in the patient's oral cavity, Ivan Sergeyevich Travkin. Travkin, exhausted from pain, was taken to Moscow. Ivan Sergeyevich first becomes a patient of a madhouse (thanks to envious persons), and then - a hero of a scientific international conference and, finally, a patient of a dentist professor Bruk.

Evgeni Leonovas Ivan Sergeyevich Travkin
Nonna Mordyukovaas Galina Petrovna Pristyazhnyuk
Inna Churikovaas Roza Lyubashkina
Lyubov Sokolovaas Lyuba Travkina
Rita Gladunkoas Frosya
Viktor Avdyushkoas Misha
Gennadiy Yalovichas Arkadiy Borisovich Sheremetyev
Nikolai Parfyonovas Prokhorov
Vilor Kuznetsovas Igor Bezrodnyy
Savely Kramarovas Rodion Khomutov
Sergey Vronsky