- Lupin(who is half asleep) receives a phone call from Fujiko that she's the first witness of a Scientist's Diamond Making robot, and told him to see it for himself. So he, Jigen, and Goemon did so, even though Lupin kept thinking he just dreamed. But by the time they go there, the Robot was taken by Gavotte, a dimwitted gangster who needs the robot as a present for his girlfriend, "Baby". Unfortunatly the robot only produces Icy Water and diamonds. So Gavotte gets his men to kidnap the Scientist and soon it becomes a series of failed exchanges between the robot and scientist, so Lupin and Gavotte agreed to do a swap site at an amusement park. But can the Robot be brought back to it's Diamond working order?—J LeGault
- Lupin is woken in the middle of the night by the telephone. He's still half-asleep, so he screams for Jigen, who is over in the next room, to answer it. Jigen does so. It's Fujiko on the phone, calling from all the way over from Dr. Pot's laboratory in Harlem. She claims he's built a robot that can produce diamond tears from its eye, and she's currently wearing a dress made of diamonds. Jigen thinks it's a joke and goes back to sleep. However, Dr. Pot is ambushed by a clownish gangster he recognizes as Gavott, who opens fire on the inventor and Fujiko. At his hideout, Gavott woos his girlfriend Baby and tells her he got the diamond-making robot she wanted. However, it only produces cold water. Baby proceeds to beat him up while his right hand man, One-Eared Joe, laughs. Gavott decides to go back and kidnap Dr. Pot in order to have the robot fixed, not knowing that Fujiko, whose diamond dress allowed her to survive the bullets, has convinced Lupin and his gang to come to New York and get the robot back. After crashing the car, the four run into Zenigata by chance and evade him. The robot is easily recovered, but as the gang returns to Pot's house, Gavott and his gang return to the hideout with the professor. After another series of antics, the crime boss learns of Lupin's involvement in the story and orders his men to storm the workshop again to get the robot back for Baby. Back at Pot's house, the gang discuss the next line of action while looking at some of Pot's seemingly useless inventions. Gavott's gang attack, forcing them to hide, but first they have to do something about the robot. A few seconds later, the assault begins, but it becomes soon apparent that neither Lupin's gang or the robot are here. Gavott's lament his fate while Baby calls him again a fourth-rate gangster and leaves the room; the crime boss then decides to think some other strategy and leaves. It turns out the gang were hiding on the chandelier, and that Lupin dismantled the robot and scattered the pieces so that Gavott couldn't find them. As he proceed to put the robot back together, Jigen reveals that Baby was still there in the bathroom: rather than harm her, Lupin asks her to tell Gavott that he's ready to exchange the robot for the professor. The exchange is to take place on a roller coaster at the amusement park where they first met. The plan is to put the professor and the robot on two different cars and then recover them once they reach the station. However, Gavott has no intention of playing fair and the police and Zenigata have everyone surrounded. Antics ensue and Lupin eventually manages to recover both the robot and Dr. Pot. The robot is fixed and from its eye it produces not diamonds, but diamond-shaped ice cubes. It turns out this was its intended purpose, and Lupin's meddling with the robot repaired it by accident. Gavott goes back to his old job as an advertising clown, Dr. Pot's robot now works in Gavott's bar for two dollars an hour and Baby and One-Eared Joe start a relationship.
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