 Maria Sid and Beata Harju, who provide voices for Moominmamma and the Mymble in the Finnish and Swedish version, also voice minor roles in the English version.According to Sophia Jansson of the Moomin Characters, the company had been careful with giving the rights to new film adaptions about the Moomins for years.When the participation rights with the Telescreen expired, Sophia Jansson became interested in the idea of animated film based on the Moomin comic strip story.