A steel-clad fiend terrorizes Tokyo, raiding clock shops. Detective Kogoro Akechi uncovers a map hidden in a prized clock, leading to a uranium deposit. He deduces the fiend is his nemesis, the Fiend with Twenty Faces.
| Actor | Role |
|---|---|
| EEiji WakasugiKogoro Akechi | Kogoro Akechi |
 Akihiko KatayamaMarquis Genjiro Mizuno | Marquis Genjiro Mizuno |
| TTakayama TakeoYoshio Kobayashi | Yoshio Kobayashi |
| SShunsuke NakamuraShoichi Mizuno | Shoichi Mizuno |
| TTakako FujinoMrs. Mizuno | Mrs. Mizuno |
 Fujio SugaChief Inspector Nakamura | Chief Inspector Nakamura |
 Jun TataraShiroemon Akaboshi | Shiroemon Akaboshi |
| MMasayoshi NaraDr. Takayasu | Dr. Takayasu |
 Kokinji KatsuraDetective Kogoro Akechi | Detective Kogoro Akechi |