Operation: Mystery (怪奇大作戦 Kaiki Daisakusen lit. Mysterious Strategy) is a mystery supernatural show produced by Tsuburaya in 1969. It was filmed after the production of Fight! Mighty Jack. Tsuburaya Productions' official international title for the series is Operation: Mystery.
Rather than focus on giant monsters, Operation: Mystery focused on more paranormal phenomena, revolving around the exploits of the Science Research Institute (SRI) as they combat these threats.
- Flesh Eating Moths
- Murder Dolls
- Samurai Phantoms
- Frozen Human Okazaki
- Snow Woman
- Makiro: Kishida Mori
- Misawa Keisuke: Suguro Homare
- Tadashi Yuya: Harumi Hara
- Hiroshi Nomura: Shoji Matsuyama (1 - 17, 19 - 26 episodes)
- Ogawa Saori: Reiko Kobashi (1 - 5, 7 - 22, 24 - 26 episodes)
- Machida Odori: Shoji Kobayashi (1, 2, 4-8, 10 - 21, 23 - 26 episodes)
- Jiro: Hiroshi Nakajima (No. 1 - 3, 11 episodes)
- Producers: Koji Morita, Koichi Noguchi, Takaaki Toyako (Tsuburaya Pro) Ken Kumagai, Yoji Hashimoto (TBS)
- Supervisor: Eiji Tsuburaya
- Music Director: Naozumi Yamamoto
- Music: Hiroki Tamaki
- Screenplay: Uehara Shozo, Kanagi Tetsuo, Sasaki Mamoru, Wakatsuki Bunzo, Ichikawa Moriichi, Fukuda Jun, Takahashi Tatsuo, Fujikawa Keisuke, Tanabe Torao, Ishido Yoshiro, Yamaura Hiroyasu
- Directors: Toshihiro Iijima, Hajime Tsuburaya, Akio Jissoji, Suzuki ShunTsugi, Tsuneo Kobayashi, Ando Tatsumi, Takashi Nagano, Shigeo Nakagi, Jun Fukuda, Kazuho Mitsuda
- Special Effects: Toru Maba, Atsushi Oki, Koichi Takano, Kazuo Sagawa
- Assistant Directors: Masataka Yamamoto, Seiichi Namba, Takehiko Ishii, Takeshi Ando, Goro Takahashi, Sei Okamura, Shohei Tojo, Hiroshi Shimura
- Shootings: Yasuzo Inagaki, Yasudo Fukuzawa, Kiyoshi Suzuki, Yoshihiro Mori, Takeshi Nakamachi
- Art: Iwasaki Masaki, Iketani Senkoku, Fukada Tatsuro, Kurahashi Toshiro
- Production Cooperation: Kyoto Film ※ Only 23rd and 25th episodes
- Production: Tsuburaya Productions, TBS
- Provided by Takeda Pharmaceutical Company Ltd.
There have been three sequels/remakes of Operation: Mystery.
- Science Investigation SRI: The Laughing Man In Flames (怪奇事件特捜チームS・R・I 嗤う火だるま男 Kagaku Tokusou SRI Warau Hidaruma Otoko) - 2004
- Operation: Mystery - Second File (怪奇大作戦 セカンドファイル Kaiki Daisakusen Sekando Fairu) - 2007
- Operation: Mystery - Mystery File (怪奇大作戦 ミステリー・ファイル Kaiki Daisakusen Misuterī Fairu) - 2013
In 2012, Tsuburaya Productions released a DVD of Operation: Mystery in HD.
- This is the last television series Eiji Tsuburaya contributed to before his death.