Vera Bendina

as Kolya (voice)

Evgeniya Mores

as Petya (voice)

Valentina Sperantova

as Sandy (voice)

Galina Novozhilova

as Natasha (voice)

Mikhail Yanshin

as Professor (voice)

Vladimir Gotovtsev

as Watchman (voice)

Liliya Gritsenko

as Navigator (voice)

Vladimir Gribkov

as Warden (voice)