Fourth film in the Boy Detectives Club series.
| Actor | Role |
|---|---|
 Eiji OkadaKogoro Akechi | Kogoro Akechi |
 Masako NakamuraMariko | Mariko |
| YYasumitsu KomoriNot listed | Not listed |
 Yoshi KatōThe Fiend with Twenty Faces | The Fiend with Twenty Faces |
 Mitsue KomiyaNot listed | Not listed |
| KKyoko KogaNot listed | Not listed |
 Jun UsamiNot listed | Not listed |