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 opening theme was performed by Mitsuko Horie (her first) when she was just 12 years old.