虫プロダクション
In 1973 an animated series based on the manga was made, produced by Yoshinobu Nishizaki and broadcast by Kansai Telecasting Corporation. As with the earlier "Triton of the Sea", Tezuka had little-to-no involvement in this series and "Wansa-kun" ultimately ended up being the last series produced by the original Mushi Production before its bankruptcy.