It all started down in Brooklyn, New York City, November 1956 when two plumbers named Mario and Luigi Mario were working down in the sewers due to all the sinks and toilets not working up in the apartment buildings and not just the apartments but almost every business company in down town Brooklyn that's been having trouble with their bathrooms, kitchens, and even their hallway drinking fountains! The Marios tried to figure out what the problem was until they heard a very unusual creaking not too far in the sewers, there was also groaning and both were coming from the long crooked water pipes. The two plumbers had their equipment ready and took a look through the dark shadowy hall with their headlamps attached to their hats on including their dust masks as it was shockingly revealed to be two big monstrous turtle like creatures roughly chomping all the hard metal water pipes! The Marios could not believe their eyes after they flashed their lights on them which startled the misshapen reptilian critters causing them to take action with the two timid plumbers, Mario Mario tries to scare them off after they sprang from the tangled pipes but all they could do was toss a few rocks which just agitates them more as one attacks Mario by the leg! Luigi uses a pipe wrench and wacks it off Mario's leg, the turtle tumbles down flipping itself over leaving Mario to just kick him and slides near the right wall five feet away which knocks it out causing the other strange looking turtle to cowardly flee down the deep dark sewage hall with him.
The Marios couldn't have much time to go after them so they had to fix those busted up water pipes that were leaking by the massive bite marks the sewer creatures made, it took almost 15 hours but they've manage to put in new pipes and now the cities' waters and sinks should be working just fine above the sewers. However while all the bussiness company buildings were working just fine it wasn't enough to save the troubles with the mayor who hardly believed the Mario brothers about two giant turtles sabotaging the pipes and if that was the case they should have catched them and dispose of them but Mario and Luigi doubted him replying that they are plumbers and not animal control, the mayor then tells them they're lucky that they're not out of the job otherwise he'd have to hire more professional and worthy plumbers who could handle these situations like the Scapelli Construction Company.
Later that night up in their apartment feeling frustrated and aggravated by the mayor's disbelief and mockery Mario vows to show him who's boss and prove to him that they're the best known plumbers who are more worthy of fixing the city's water supplies than Scapelli's business will ever be, Luigi wasn't so sure about his brothers theory but he too wouldn't want to be out of the job either so he just briefly flatters him and hopefully they won't have to worry about plumbing down in the deep dark sewers again after going through that strangely bizarre incident today.