Ep. 20: Zenigata, Gentleman Thief
Lupin, Jigen and Goemon take a trip to one of their old haunts in Russia to carry out some easy heists. To their surprise, they find another party of thieves already raiding the same targets with their old enemy Zenigata among their ranks. When Lupin talks with Zenigata, he finds that the latter has alcoholic amnesia from a massive drinking bout after another failure to catch Lupin. Zenigata has adopted the alias "Monety" and the modus operandi of his old nemesis Lupin while trying to uncover his lost identity. Unwilling to leave Zenigata in that condition, Lupin and company intercept Zenigata at the site of his next heist. When Lupin and Zenigata escape the crime scene together, the encounter finally snaps Zenigata's memory back into place, and to everyone's relief their relationship returns to its usual state. (Source: Wikipedia)