One fine morning, a handsome and dexterous Lion Cub realized that he did not have a "true friend." How can a clumsy and fat Hippopotamus Borya be a true friend? No! Only the "Mysterious Hippopotamus" can become the most. Upon learning about this, the Lion Cub, allowing the clumsy Hippopotamus to accompany him, went in search of a Hippopotamus. He had to experience many different adventures. And every time his ordinary friend, the Hippopotamus Borya, came to the rescue.
| Actor | Role |
|---|---|
 Fyodor ViolinNot listed | Not listed |
 Viktor RyabovNot listed | Not listed |
 Ekaterina BabayevaNot listed | Not listed |
 Yevgeniy NachalovNot listed | Not listed |
 Sergey MukhinNot listed | Not listed |
| LLeonid BuninNot listed | Not listed |
| NNikolay AleksakhinNot listed | Not listed |