Minami Takayama as Moomintroll (voice)

Ryusei Nakao as Sniff (voice)

Rei Sakuma as Little My (voice)

Takehito Koyasu as Snufkin (voice)

Mika Kanai as Snorkmaiden (voice)

Akio Otsuka as Moominpappa (voice)

Ikuko Tani as Moominmamma (voice)

Yasuyuki Hirata as Snork (voice)

Masato Yamanouchi as Muskrat (voice)

Minoru Yada as Hemulen (voice)

Takaya Hashi as Police Inspector (voice)

Sumi Shimamoto as Fillyjonk (voice)

Yuko Kobayashi as Mymble (voice)

Fumihiko Tachiki as Astronomer #1 (voice)

Kazuomi Ikeda as Astronomer #2 (voice)

Ryuzou Ishino as Fubble (voice)