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)

Lupin, the master thief/spy/Jack of all Trades, has been executed, but he is still alive, and not even Lupin himself knows how that is possible. While trying to figure out, however, he and his gang are thrust into a conspiracy involving clones, Lupin's un-trustworthy rival Fujiko, and a miniature madman's plot to take over the world.

(Source: ANN)

Mysterious Babylonian Tablets unearthed in Manhattan provide tantilizing clues about the location of the Tower of Babel - not the biblical one, but the original one, built out of solid gold! 

The Mob is out to get the gold, but so is Lupin III. 

It's Thugs vs. Thieves when Lupin & Co. go up against a fearsome flyswatting Polish Mafia boss, a bevy of beauty-contest policewomen, Zenigata, the hard-luck Interpol Inspector, a mysterious bag-lady AND his own girl-friend in a trans-continental trust-nobody trek after a treasure of biblical proportions! 

(Source: AniDB)

After a diamond heist in Brazil, Lupin hides the gem in a doll and boards a plane headed out of the country. While on board, the doll is stolen by a little girl named Julia, whose nanny is none other than Fujiko Mine. Before Lupin can get the doll back, the plane is hijacked and the girl is kidnapped. The kidnappers are after the same thing that Fujiko is after - a book of Nostradamus prophecies hidden in Julia's father's tower. Lupin and the gang join forces to save the girl, get the diamond back, and discover the secrets surrounding the strange book. 

(Source: ANN)