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

With the assistance of mushroom Toad and some essential battle training from Mushroom Kingdom ruler and warrior Princess Peach, Mario taps into his own power and perseveres, determined that as long as he and Luigi have each other, anything is possible.