Lupin VIII (The 8'th) was a series that never made it out of production. The French animation studio DiC collaborated with the producers of Lupin III over in Japan for this series. The first episode was fully animated with a music and sound effect track. But before the actors could record their lines for the episode, the series was stopped due to copyright problems regarding the Arsène Lupin name. For more information regarding Lupin VIII,
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Luckily the un-voiced animation of the 1'st Episode along with some Character Model Sheets and production Cels surfaced. So take a look.