Cat Coda, donkey Largo, dog Allegro, and hen Minuet are transformed from animals to people with alien technology to form a musical group, the Bremen 4. But when invading forces led by Colonel Presto are slaughtering their peaceful village, the musicians must band together and spread a message of peace with music, might, and a little bit of underground anti-fascist guerrilla warfare.
| Actor | Role |
|---|---|
 Hiroya IshimaruAlegro (voice) | Alegro (voice) |
 Mari OkamotoCoda (voice) | Coda (voice) |
 Kei TomiyamaLargo (voice) | Largo (voice) |
 Hisako KyodaMinuet (voice) | Minuet (voice) |
 Nachi NozawaBlack Jack (voice) | Black Jack (voice) |
 Chikao OhtsukaGeneral Presto (voice) | General Presto (voice) |
 Kazuko YanagaRondo (voice) | Rondo (voice) |
 Kosei TomitaAdagio (voice) | Adagio (voice) |
 Makio InoueColonel Karl Presto (voice) | Colonel Karl Presto (voice) |
 Masako SugayaTrio (voice) | Trio (voice) |
 Mahito TsujimuraBaron Lento (voice) | Baron Lento (voice) |
 Takashi TaniguchiLeader (voice) | Leader (voice) |
| TTomoko MunakataTrio's mother (voice) | Trio's mother (voice) |
 Tomomichi NishimuraDon Dracula (voice) | Don Dracula (voice) |
 Aruno TaharaNot listed | Not listed |
 Hiroshi MasuokaNot listed | Not listed |
 Kenichi OgataNot listed | Not listed |
 Masashi HiroseNot listed | Not listed |