|Rōmaji||Kieta Haruto! Aratanaru Teki: Toron|
|Japanese Translation||Missing Haruto! The New Enemy, Tron|
|Japanese air date||January 30, 2012|
|English air date|
|Next Episode||A Dubious Duo|
|Previous Episode||About Hart|
"Losing Hart", known as "Missing Haruto! The New Enemy: Tron" in the Japanese version, is the 41 episode of the Yu-Gi-Oh! ZEXAL anime. It first aired in Japan on January 30, 2012, and in the United States on December 8, 2012.
Nistro and Dextra, later joined by Kite, confront Yuma about the whereabouts of Hart, managing to provide a description of the kidnapper thanks to Astral. After Nistro and Dextra leave, Kite agrees to let Yuma help search for Hart. Whilst Astral deduces that Mr. Heartland has a strong role in the mystery surrounding Hart, Hart is brought before Vetrix, who performs a ritual to transfer Hart's powers into his body. Hart's painful cries for help are heard by both Kite and Astral, leading them to a castle in the middle of a lake. Upon entering the castle, Yuma and Kite are confronted by Trey and Quattro, who force them into a Tag Duel.