, known outside Japan as Judo Boy, is a Japanese anime television series created by Tatsuo Yoshida and his brother Ippei Kuri loosely based on the manga written by Yutaka Arai and Kuri and illustrated by Yoshida. The series aired on Fuji TV from April 2, 1969, to September 24, 1969, totaling 26 episodes. The series was also followed by two manga adaptations, the first written by Masato Tenma and illustrated by Kuri published in Shogakukan's Weekly Shà Ânen Sunday from July 28 to November 17, 1968, and a four-chapters series written by Yoshida and illustrated by Mamoru Uchiyama in Shueisha's Weekly Shà Ânen Jump from May 22 to July 10, 1969.
The series stars a teenage martial artist named Sanshiro (voiced by Ikuo Nishikawa), trained in the Kurenai School of jiu-jitsu and centers around his search for his fathers killer. Accompanying Sanshiro is an orphaned boy named Kenbo (voiced by Kenbo Kaminarimon) and his pet dog Boke (voiced by Hiroshi Otake). Sanshiros only clue to his fathers murderer is a glass eye left on the scene of the crime, suggesting that his fathers murderer was one-eyed. Thus many of the villains Sanshiro fought during the course of the series were one-eyed or had one eye concealed with an eye-patch.
The second opening theme was performed by Mitsuko Horie (her first) when she was just 12 years old.