- Minami Takayama (Conan Edogawa (voice))
- Kappei Yamaguchi (Shinichi Kudo (voice))
- Wakana Yamazaki (Ran Mouri (voice))
- Akira Kamiya (Kogoro Mouri (voice))
- Rikiya Koyama (Kogoro Mouri (voice))
- Megumi Hayashibara (Ai Haibara (voice))
- Kenichi Ogata (Hiroshi Agasa (voice))
- Yukiko Iwai (Ayumi Yoshida (voice))
- Wataru Takagi (Genta Kojima (voice))
- Ikue Otani (Mitsuhiko Tsuburaya (voice))
- Chafurin (Juzo Megure (voice))
Detective Conan — S1E155
Episode: The Key in the Water Locked Room Case
Air Date: 1999-08-02
Runtime: 25 min
Overview
Kogoro, Ran, and Conan pay a visit to an old woman. She decides to take them to her grandson, but he's found dead when they get into the house. The bathroom door is locked however. How could this have happened?