Lupin the 3rd Part I

Lupin the 3rd Part I is a Japanese anime television series produced by Tokyo Movie. Part of the Lupin III franchise, it is the first anime television adaptation of the Lupin III manga series created by Monkey Punch. The series was originally broadcast as simply Lupin III (Japanese: ルパン三世, Hepburn: Rupan Sansei) on Yomiuri TV, Nippon Television and other stations between October 24, 1971 and March 26, 1972. Among English-speaking fans, this series was commonly known as the "Green Jacket" series in reference to Lupin's outfit, but more recently it is now known as "the first Green Jacket" series because of the outfit's return in Part 6.

Production of the show began after the pilot film was approved by the committee, and was originally intended to be released as a stand-alone animated film. Notable industry veterans, including future Ghibli co-founders Hayao Miyazaki and Isao Takahata, were among the show's staff, with the show's animation being handled by A Production (now Shin-Ei Animation). Nevertheless, the show received scrutiny during its run due to its mature themes, leading director Masaaki Osumi's firing and replacement by Miyazaki and Takahata, and was eventually cancelled around 23 out of the planned 26 episodes due to low ratings.

Eventually, the show received positive critical reevaluation as reruns followed to higher ratings and is now considered to be one of the greatest anime ever made. Critics have highlighted the show's place in the animation medium, which was at its darkest age during the late 60s and early 80s, as well as influencing public perception of animation in Japan as catering to a general audience.