Kolobok, telling his grandchildren a long-tired fairy tale about himself, decides that it’s time for the kids to learn about his new adventures. Kolobok will tell how he became a knight under Tsar Guidon, how he became the owner of a magic sword, the armor of Alyosha Popovich, and how he had to fight with various fairy-tale villains, among whom was the most terrible and terrible Koschey the Immortal, who kept a heroic maiden in his prison Marya Morevna.