Case Closed: Black Iron Submarine, known as Detective Conan: Black Iron Submarine in Japan, is a 2023 Japanese animated mystery film directed by Yuzuru Tachikawa. It is the twenty-sixth installment of the Case Closed film series based on the manga series of the same name by Gosho Aoyama, following the 2022 film Detective Conan: The Bride of Halloween. The film was released in Japan on April 14, 2023.

Shūichi Ikeda is a Japanese actor and narrator. Ikeda is married to Sakiko Tamagawa, although he was once married to Keiko Toda. He currently works for Tokyo Actor's Consumer's Cooperative Society. He is best known for his role as Char Aznable in multiple Gundam series, Scorpio Milo in Saint Seiya 1980s, Shuichi Akai from Detective Conan, and Red-Haired Shanks from One Piece. He is also the official Japanese dubbing roles for Jet Li. In 2023, Ikeda was a recipient of the Best Supporting Actor Award at the 17th Seiyu Awards.