Three from Prostokvashino

Three from 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 and Winter in Prostokvashino. The main character is a six-year-old boy who is called Uncle Fyodor because he is very serious.