Judo Boy (紅三四郎 Kurenai Sanshiro?, "Scarlet Sanshiro") is a Japanese animated television series created by Tatsuo Yoshida and directed by Ippei Kuri. The series aired on Fuji TV from April 2, 1969 to September 24, 1969, totaling 26 episodes.
The series stars a teenage martial artist named Sanshiro (voiced by Ikuo Nishikawa), trained in the Kurenai School of Jiujitsu and centers around his search for his father's killer. Accompanying Sanshiro is an orphaned boy named Kenbo (voiced by Kenbo Kaminarimon) and his pet dog Boke (voiced by Hiroshi Otake). Sanshiro's only clue to his father's murderer is a glass eye left on the scene of the crime, suggesting that his father's 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 opening theme was performed by Mitsuko Horie (her first) when she was just 12 years old.
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