In early 20th century Moscow, a stray dog named Samson escapes from animal catchers and ends up in the Bolshoy Theater. There, he befriends the prima ballerina's dog and together they embark on a mission to recover a stolen decoration that belongs to the ballerina. Samson's bravery and loyalty are put to the test as he navigates the challenges of the theater world and helps his new friends. Can they succeed in their quest and save the day?