Times are tough in the ghetto. Sadly, greedy business rats have conspired to underpay their rodent laborers, and Fievel's papa works night and day to put cheese on the table. In league with corrupt police, the factory owners keep a watchful eye on Mr. Mousekewitz, who's a spokesperson for the working mice. Meanwhile, Fievel and his pals, Tony Mouse and Tiger Cat, explore an abandoned subway and stumble upon a treasure map from a subterranean city inhabited by Native American mice. Unfortunately, ingenuous Fievel takes the map to Dr. Dithering, whose assistant Scuttlebutt is a paid informant for the business rats. Accompanied by Scuttlebutt, Fievel's exploratory party...