In the film an ancient Lithuanian legend is told about an origin of amber. For the sake of love to fisherman Kastytis sea tsarevna Jurate offered herself up. Her fiance, terrible god Perkunas destroyed the amber castle where she lived and it scattered into a thousand slices.
| Actor | Role |
|---|---|
 Aleksey KonsovskiyCastystis (voice) | Castystis (voice) |
 Margarita KupriyanovaYurate (voice) | Yurate (voice) |
 Vladimir YershovPerkunas (voice) | Perkunas (voice) |
 Irina GoshevaCastystis' Mother (voice) | Castystis' Mother (voice) |
 Tatyana StrukovaThe Swordfish (voice) | The Swordfish (voice) |
 Galina IvanovaThe Fish (voice) | The Fish (voice) |