While working underground to fix a water main, Brooklyn plumbers—and brothers—Mario and Luigi are transported down a mysterious pipe and wander into a magical new world. But when the brothers are separated, Mario embarks on an epic quest to find Luigi.

Mario and Luigi, plumbers from Brooklyn, find themselves in an alternate universe where evolved dinosaurs live in hi-tech squalor. They’re the only hope to save our universe from invasion by the dino dictator, Koopa.