Three from Prostokvashino (Russian: Трое из Простоквашино, tr. Troye iz Prostokvashino) is a 1978 Soviet animated film based on the children's book Uncle Fedya, His Dog, and His Cat by Eduard Uspensky. The film has two sequels, Vacations in Prostokvashino (Каникулы в Простоквашино) (1980) and Winter in Prostokvashino (Зима в Простоквашино) (1984).
The main character is a six-year-old boy who is called Uncle Fyodor (voiced by Mariya Vinogradova) because he is very serious. After his parents don't let him keep the talking cat Matroskin (voiced by Oleg Tabakov), Uncle Fyodor leaves his home. With the dog Sharik (voiced by Lev Durov), the three set up a home in the country village Prostokvashino (Russian: Простоквашино; IPA: [prəstɐˈkvaʂɨnə], "soured milk"). There they have many adventures, some involving the local mailman, Pechkin (voiced by Boris Novikov).