The Lost Legend is a 2021 Live-action drama TV series based on Kinnikuman. The manga creator duo known as Yudetamago resumed their original Kinnikuman wrestling manga as a free web manga in 2011. The creators went back to their first 1979 Kinnikuman storyline and continued where they last left the story in 1987. The original manga has inspired various television anime series and films. Yudetamago previously published a Kinnikuman one-shot manga in Shueisha's Grand Jump magazine in 2015, and then published a one-shot in Weekly Shonen Jump for the first time in 11 years in June 2019.
Tetsuaki Matsue the director of the series, and Takeshi Takemura the screenwriter previously collaborated on the manga-based documentary series Yamada Takayuki no Tokyo Kita-ku Akabane.