Buck is a half German Shepard half Saint Bernard whose life is peaceful and happy living with the Millers in California. However, one day he is tricked and sold off. He ends up in the snowy North where he has become a sled dog during the Gold Rush. His story takes many twists and turns and he has to fight for his own survival.
| Actor | Role |
|---|---|
 Osamu KobayashiJohn Thornton (voice) | John Thornton (voice) |
 Toshio FurukawaPerrault (voice) | Perrault (voice) |
 Hideyuki TanakaFrançois (voice) | François (voice) |
 Takeshi AonoManuel / Bob (voice) | Manuel / Bob (voice) |
 Keiichi NodaPete (voice) | Pete (voice) |
 Mami KoyamaMercedes (voice) | Mercedes (voice) |
 Koji YadaO'Prien (voice) | O'Prien (voice) |
 Yonehiko KitagawaMatthewson (voice) | Matthewson (voice) |
| YYasuo TanakaHans (voice) | Hans (voice) |
 Yoku ShioyaHaru (voice) | Haru (voice) |
 Shinji NomuraCharles (voice) | Charles (voice) |
 Koji IshizakaNarrator (voice) | Narrator (voice) |