Police investigate a series of mysterious murders where the only clue is a strange buzzing noise at the scene of the crime.
| Actor | Role |
|---|---|
| YYoshirō KitaharaChief Inspector Wakabayashi | Chief Inspector Wakabayashi |
 Junko KanoAkiko Hayakawa | Akiko Hayakawa |
 Ryūji ShinagawaDr. Tsukioka / The Invisible Man | Dr. Tsukioka / The Invisible Man |
 Ikuko MōriMieko | Mieko |
 Jōji TsurumiSugimoto | Sugimoto |
 Yoshihiro HamaguchiDetective Hayama | Detective Hayama |
 Shōzō NanbuDr. Hayakawa | Dr. Hayakawa |
 Bontarō MiakeChief of the Metropolitan Police | Chief of the Metropolitan Police |
 Ichirō IzawaKôkichi Kusunoki / The Human Fly II | Kôkichi Kusunoki / The Human Fly II |
 Shizuo ChūjōYamada / The Human Fly I | Yamada / The Human Fly I |
 Koh SugitaHajima | Hajima |
 Tatsuo HanabuDirector Tada | Director Tada |
 Fujio HarumotoNot listed | Not listed |
| KKōichi ItōNot listed | Not listed |
| TTeppei EndōDoctor | Doctor |
 Gen HaradaNot listed | Not listed |
| CChikayo MatsuoWaitress | Waitress |
 Jiro TamiyaPlane Passenger (uncredited) | Plane Passenger (uncredited) |