Treasure of the Sierra Brooklyn
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The episode opens with Luigi attempting to watch television. However, Mario is doing some noisy plumbing, and Luigi tells him to stop, as he is distracting him from the television. Mario says that he only needs to remove one more object from a pipe and, after some tugging, pulls it out. Mario realizes that he has pulled out a treasure map of Mario Brothers Plumbing, and the two brothers look at it. Luigi begins reading out some of the directions and the two follow it, but they do so in different ways. They soon bump into each other, and Mario begins complaining about the absurdity of treasure being in their apartment. Luigi agrees, but suggests showing it to Inspector Gadget first before completely doubting it. Mario says that Gadget's phone number is on a propeller cap that he happens to have, and he reads it out as Luigi dials it. Since it is "555-1234567890", Luigi assumes he is joking, but Gadget quickly answers the call (the theme song for the Inspector Gadget cartoon also starts playing). He tells Gadget that they have actual treasure in their home, and Gadget responds by telling him that he is on his way immediately. As soon as Luigi hangs up, Inspector Gadget is at their door. As Gadget enters, he declares that he meant that he was on his way "immediately". His hand then falls off of his arm, and he says that it always happens. Mario and Luigi are confused about this as the show fades to the commercial break.
The show fades in to Inspector Gadget shouting at his hand, holding a hammer, to work. It fails to do anything, and he starts hitting it. Luigi asks if he can help, but Gadget asks him to step back before the hammer starts working. Before he can finish his thought, though, the hammer "activates" and promptly hits Luigi in the face. He apologizes and then begins demolishing part of their wall. Mario congratulates Luigi for seemingly fixing his hammer, but Luigi only complains that they could have demolished the wall without him. Gadget turns to another wall and attempts to hit it, but a puppet on the wall comes to life and hurriedly tells him that there is no treasure next to him. He then continues down and tries to demolish that part, but the CooKoo Bird pops out, shouting at Inspector Gadget to leave and telling Mario and Luigi to kick him out. Mario quickly realizes that, if Gadget continues, he might destroy the entire building.
Mario, Luigi, and Gadget then begin following the directions on the map again. Gadget takes three steps forward and Mario says that the treasure could be under his feet. He tries to check by lifting up a chair, but he ends up lifting it with such force that he tumbles into the floor and creates a hole. While stuck in the floor, he mentions that his sensor for balance sometimes stops working. Mario reassures him by saying that it could happen to anyone before helping him out. Luigi looks into the hole and says that he sees something lying at the bottom. He assumes that it is the treasure, and he decides to go down and look for himself. Mario tells him to be careful, but he reponds by saying that it is no issue for a Luigi like him. He soon comes out with a box, still believing it to be treasure, but Mario tells him that he pulled out the breaker box. The lights in the apartment also flicker after Luigi pulls out the box. Gadget then looks at the map himself, and exclaims that it is actually a plan for Brooklyn's electric grid. Luigi, not hearing him, then pulls out some wires. As Gadget reads the warning on the wires that says to not remove them, otherwise the entire district loses power, all of the lights go out. Luigi shouts for an electrician as the episode ends.
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