Maciej Litkowski
— Joko (voice)
Anna Januszewska
— Mother (voice)
Beata Zygarlicka
— Wanda (voice) / Additional Voices (voice)
Konrad Pawicki
— Sir Barnet (voice) / Baptist (voice)
Arkadiusz Buszko
— Doctor Fersen (voice) / Professor Krank (voice)
Paweł Niczewski
— Doctor (voice)
Adam Kuzycz-Berezowski
— Bavastro (voice)
Maria Dąbrowska
— Amica (voice)