It's time for the Prince of Kiev to choose his heir. That's just who it will be? The Prince falls for the niece of the Fun Putyatishna. But she lives with her husband Elisha in distant Constantinople, which is ruled by the evil Basil. To return the heiress home, three heroes go to far away lands: Ilya Muromets, Dobrynya Nikitich and Alyosha Popovich, as well as the court horse Julius.

""Three heroes and heir to the throne" is a Russian full – length animated film by Konstantin Bronzit, telling about the adventures of three heroes-Alyosha Popovich, Dobrynya Nikitich and Ilya Muromets. This is the ninth cartoon from the franchise "Three heroes".