Lupin III: The Mystery of Mamo, also known as Lupin III: The Secret of Mamo, is a 1978 Japanese animated science fiction action adventure comedy film. It is the first animated feature film based on the 1967–69 manga series Lupin III by Monkey Punch. The film was originally released in Japan as Lupin III (ルパン三世, Rupan Sansei), but was later retitled to Lupin III: Lupin vs. the Clone (ルパン三世 ルパンVS複製人間, Rupan Sansei Rupan tai Kurōn). Directed by Sōji Yoshikawa, who co-wrote the screenplay with Atsushi Yamatoya, the film was produced by animation studio Tokyo Movie Shinsha and distributed by Toho. The film's plot follows master thief Lupin III, who attempts to foil Mamo ― a wealthy and powerful recluse seeking immortality ― while trying to win the affections of his rival and would-be lover, Fujiko Mine.