Cast
| Name | Character | Team | |
|---|---|---|---|
 |
Klara Rumyanova | Ivan Semenov (voice) | Unowned |
 |
Tamara Dmitrieva | Ivan's classmate (voice) | Unowned |
 |
Antonina Dmitrieva | The teacher (voice) | Unowned |
 |
Mikhail Yanshin | First doctor (voice) | Unowned |
 |
Anatoliy Papanov | Second doctor (voice) | Unowned |
 |
Georgiy Vitsin | Third doctor (voice) | Unowned |