| Case Closed Episode One: The Great Detective Turned Small | |
 North American key visual | |
| 名探偵コナンエピソード"ONE" 小さくなった名探偵 (Meitantei Konan Episōdo "Wan" Chīsakunatta Meitantei) | |
|---|---|
| Genre | |
| Anime television film | |
| Directed by | Yasuichiro Yamamoto |
| Produced by |
|
| Written by |
|
| Music by | Katsuo Ōno |
| Studio | TMS/V1 Studio |
| Licensed by | |
| Original network | NNS (ytv) |
| Released | December 9, 2016 |
| Runtime | 94 minutes |
Case Closed Episode One: The Great Detective Turned Small, known as Detective Conan Episode "ONE" - The Great Detective Turned Small (名探偵コナンエピソード"ONE" 小さくなった名探偵, Meitantei Konan Episōdo "Wan" Chīsakunatta Meitantei) in Japan, is the sixth animated television special of Case Closed. It was broadcast on the Nippon Television Network System on December 9, 2016. The special, whose subtitle is the same as the second chapter of the manga, serves as a retelling of the entire first and part of the second episodes of the original anime series. It has newly added story elements, not seen in those episodes.