Super Mario Bros.

The Mario Brothers are being driven out of business by the mafia named Scapelli Construction Company. Luigi falls in love with an orphaned NYU student, Daisy, who is digging under the Brooklyn Bridge for dinosaur bones. They go on a date and she takes Luigi to the dig and sees Scapelli's men sabotage the site by leaving the water-pipes open. Luigi tries to stop it but he does not have his tools on him so he can not fix it. They rush back to his apartment where they tell Mario about it. The three go back to the flooding and the Mario Bros. manage to fix it but are knocked out by two strangers, Iggy and Spike. The two kidnap Daisy.

Mario and Luigi awaken a while later and head into the caves following Daisy's screaming and discover a portal. Mario and Luigi follow Daisy. They find themselves in a strange parallel world where a race of people evolved from dinosaurs rather than the mammalian ancestry of true humans. Sixty-five million years ago, a meteorite crashed into the Earth, and in doing so ripped the universe into two parallel dimensions. All the surviving dinosaurs of the time crossed over into this new realm before being sealed there forever. Iggy and Spike turn out to be workers of King Koopa. King Koopa's goal is to merge his world with the real world. It turns out that Daisy is the princess of the other dimension but when Koopa overthrew Daisy's father, Daisy's mother took her to New York using the portal. The portal exploded and killed Daisy's mother. When Anthony Scapelli was blasting at the cave, the portal was reopened. When Koopa hears about the re-opening of the portal, he sends Spike and Iggy to find Daisy and the rock to merge the dimensions and make Koopa the king of both worlds. Spike and Iggy decide to turn on Koopa and join forces with Mario and Luigi. Koopa thinks only Daisy can merge the worlds. It turns out Mario and Luigi were just in the wrong place at the wrong time.

During the big finale, the worlds merge, during which Scapelli gets his comeuppance when Koopa turns him into a primate by mistake while aiming for Mario, but Luigi and Daisy take back the rock and the worlds separate. Mario fights the Koopa King and wins when he and Luigi devolve him, transforming him into a ferocious Tyrannosaurus. Koopa then leaps out for one last attack but Mario and Luigi turn him into primeval slime, killing him. The brothers save the two worlds from King Koopa and Daisy's father turns back to normal ( From being a Toad) and reclaims control over the kingdom. The brothers return home, Luigi and Daisy tell each other that they love the other but Daisy cannot return to New York until they fix the kingdom. Mario rephrases Daisy's words to Luigi but he doesn't care. He is deeply hurt and Luigi kisses her goodbye and the the Mario Bros. go back to New York. Daisy, Yoshi and Toad, all watch them leave. About three weeks later, Daisy returns for Mario and Luigi's help in fighting more villains. Meanwhile, Mario and Luigi's story is televised, giving them their name "Super Mario Bros."