I believe it can be safely said, without hyperbole, that the Super Mario Bros. movie was created following one of the most baffling executive brainstorming sessions in recorded history. They must have sent some intern out to have a vision quest in the Mojave Desert with nothing but a screenshot of the game and a water filter for his own urine, then turned his inevitable police statement into a motion picture.
Instead of a lush fantasy kingdom, Mario and Luigi are bombing around in a subterranean alternate universe that looks like an unused set from Total Recall. Instead of a fire-breathing turtle dinosaur with nipple-shearing wrist collars of sexual destruction, Koopa looks like a pit boss from Biff Tannen's Pleasure Paradise. And Big Bertha, a giant fish that relentlessly tries to eat Mario and Luigi in the games, is reimagined for the film as a fat black woman in stripper armor. Super Mario Bros. is the rare case in which being familiar with the source material actually makes the film more confusing.
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Although in fairness, she still looks like she wants to eat them.
It's twofold -- Princess Daisy comes back to New York to grab the Super Mario Brothers and tell them she needs their Super Mario Help on another adventure. Then, mercifully, the credits roll, but after they're over, we're treated to one more scene with Iggy and Spike Koopa getting their own spinoff video game, just in case there was anyone still left in the theater for some inexplicable reason.