A beautiful summer day in Moomin Valley. Suddenly, a wasp stings Moomintroll, who falls ill and has to stay in bed. To cheer him up, Moominpappa recounts his youthful adventures; his misunderstood childhood, escape from an orphanage and his historic meeting with the inventor Hodgkins.
Akira Takaki
as Muumipeikko (voice)
Alma Pöysti
as Nuori Muumimamma / Mymmeli / Pikku Myy (voice)
André Wickström
as Hosuli / Nipsu / Haisuli (voice)
Jenna Hukkinen
as Niiskuneiti / Tahmatassu / Siili / Sosuli / Mymmelilapsi (voice)
Markus Bäckman
as Fredrikson / Muumipappa / Apulainen (voice)
Miiko Toiviainen
as Nuori Muumipappa (voice)
Nina Hukkinen
as Muumimamma / Hemulin täti (voice)
Stan Saanila
as Juksu / Edward / Itsevaltias / Hemuli / Nuuskamuikkunen (voice)
