The episode focuses on Lupin's gang descending upon the Kingdom of Dorrente in order to rescue a famous thief who has been detained. While this takes place, the most notorious thieves from around the world gather in the kingdom. (Source: MAL News)

A remastered version of the Pilot film, realised in 1978, re-photographed in cinemascope and re-dubbed for being screened in cinema before of 1st movie [Mamoo's 1st copy]. In 1989, it was included on the Lupin III - Secret File OVA.

After robbing a Moscow casino right under Zenigata's nose, Lupin sets his sights on stealing the Trick Diamond. He and Jigen head to the estate of the recently deceased Mark Williams, another master thief who's had the diamond, as well as other treasures, in his possession for years. However, instead of finding the diamond, Lupin & Jigen find Fujiko, who tells them about Mark's dying wish - Lupin must return all the treasures the old thief stole to their rightful place. If this is done in time, the location of the diamond will be revealed, and Lupin can use it to get the real treasure, hidden in Gaudí's Sagrada Familia. Returning the stolen goods isn't easy though, as Zenigata and the casino boss' ruthless gang are on Lupin and friends' tail. (Source: ANN)

Two years after the birth of the manga a pilot film was released. It was a brief film of only 13 minutes that had the purpose of assay the response to a possible future anime realization of Lupin III. The pilot opens with a challenge call from Lupin to Zenigata from a public phone. (Source: AniDB)