(0 votes, average: 0.00/10)- Country: Japan
- Genres: Horror, Sci-Fi
- Release: 1968-09-15
- Director: N/A
- Writers: N/A
- Language: Japanese
- Stars: Homare Suguro , Shin Kishida , Seiji Matsuyama , Yasumi Hara , Reiko Kobashi , Akiji Kobayashi , Rokkō Toura , Daigo Kusano , Shôji Nakadai , Yasuhiko Saijô
- Runtime: 25 min
- Awards: N/A
- AKA: Operation: Mystery! (United States of America) , Kaiki daisakusen , S.R.I. und die unheimlichen Fälle , Operation: Mystery! , Kaiki daisakusen (Japan)
- Plot: The Science Research Institute (SRI) investigates assorted strange phenomenon in Japan.
- IMDB:tt0195480
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