London high-society mouse, Roddy is flushed down the toilet by Sid, a common sewer rat. Hang on for a madcap adventure deep in the sewer bowels of Ratropolis, where Roddy meets the resourceful Rita, the rodent-hating Toad and his faithful thugs, Spike and Whitey. The story of an uptown rat that gets flushed down the toilet from his penthouse apartment, ending in the sewers of London, where he has to learn a whole new and different way of life.