Masako Nozawa

as Isamu (voice)

Kurumi Kobato

as Angel (voice)

Gorō Naya

as King Magma VII (voice)

Akira Hitomi

as Tail (voice)

Katsuwo Umino

as Octopus (voice)

Yonehiko Kitagawa

as Sea King (voice)

Reiko Seno

as Isamu's Mother (voice)

Tetsuya Kaji

as Isamu's Father (voice)

Ichirô Murakoshi

as Captain (voice)

Keiichi Noda

as Announcer (voice)