| Actor | Role |
|---|---|
 Klara RumyanovaIvan Semenov (voice) | Ivan Semenov (voice) |
 Tamara DmitrievaIvan's classmate (voice) | Ivan's classmate (voice) |
 Antonina DmitrievaThe teacher (voice) | The teacher (voice) |
 Mikhail YanshinFirst doctor (voice) | First doctor (voice) |
 Anatoliy PapanovSecond doctor (voice) | Second doctor (voice) |
 Georgiy VitsinThird doctor (voice) | Third doctor (voice) |
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