Flushed Away (2006)

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.
 
Directors:  David Bowers, Sam Fell
Writers:  Dick Clement (screenplay by), Ian La Frenais 
Stars:  Hugh Jackman, Kate Winslet, Ian McKellen