Ep. 6: Lupin vs. the Smart Safe
In order to save their family workshop from foreclosure, a young inventor suggests to his brainless older brother that Lupin may be the answer to their financial problem. They build a smart safe for the Greater Tokyo Bank which can only opened by someone with no brainpower, as a special challenge to Lupin, the world's smartest thief. Vexed by the resilience of this obstacle, Jigen, Fujiko and Goemon begin to implement a sadistic regime of sleep deprivation, beating and exercise to kill off Lupin's brain cells. However, at the publicized event of the safe's opening, Lupin instead consumes many blueback fish, boosting his brains so that the safe's IQ counter overflows to zero, thus opening the safe. While the contest ends in a draw, the brothers become celebrities and begin selling canned fish, recovering their property. (Source: Wikipedia)