Balto and the other sled dogs are feeling dejected because the mail that used to be delivered by dogsled is now being delivered by airplanes. But when a mail plane crashes in the mountains, the dogs come to the rescue.
| Actor | Role |
|---|---|
 Maurice LaMarcheBalto / Moose 1 / Moose 2 (voice) | Balto / Moose 1 / Moose 2 (voice) |
 Jodi BensonJenna (voice) | Jenna (voice) |
 Sean AstinKodi (voice) | Kodi (voice) |
 Charles FleischerBoris / White Mountain Postmaster (voice) | Boris / White Mountain Postmaster (voice) |
 Bill FagerbakkeRalph / Mr. Conner (voice) | Ralph / Mr. Conner (voice) |
 Keith CarradineDuke (voice) | Duke (voice) |
 Charity JamesDusty (voice) | Dusty (voice) |
 Kathy NajimyDipsy (voice) | Dipsy (voice) |
 David PaymerMel (voice) | Mel (voice) |
 Kevin SchonMuc / Luc / Simpson (voice) | Muc / Luc / Simpson (voice) |
 Jean SmartStella (voice) | Stella (voice) |
 Carl WeathersKirby (voice) | Kirby (voice) |