Grandma Bine and her two grandchildren are searching for the Mysterious Island, which, according to legend, becomes visible only under certain weather conditions: when it rains, when it snows, and when the sun shines.
| Actor | Role |
|---|---|
 Alex PolidoriRiky (voice) | Riky (voice) |
 Domitilla D'AmicoPalli (voice) | Palli (voice) |
 Antonella GianniniBine (voice) | Bine (voice) |
| MMirko MazzantiMusonio (voice) | Musonio (voice) |
 Marco VivioIsi (voice) | Isi (voice) |
 Francesca GambacortaScilla (voice) | Scilla (voice) |
 Monica WardPato (voice) | Pato (voice) |
 Perla LiberatoriZiba (voice) | Ziba (voice) |
 Barbara PitottiFrizy (voice) | Frizy (voice) |
 Alberto AngrisanoRapaki (voice) | Rapaki (voice) |
 Michele KalameraFuscus (voice) | Fuscus (voice) |