A collaboration between DreamWorks Animation and the UK's Aardman Features, this delightful computer animation is less twee than Wallace & Gromit: The Curse of the Were-Rabbit, with more action and a broader American sensibility. A posh pet mouse (voiced by Hugh Jackman) is booted down a Kensington sewer to an underground replica of London where he helps an intrepid rat (Kate Winslet) battle a loathsome gangland toad (Ian McKellen). Bill Nighy and Andy Serkis are the toad's dim henchmen, and Jean Reno is hilarious as Le Frog, leader of some inept Gallic ninjas. But they're all upstaged by the Greek chorus of stem-eyed slugs, who emit sound effects and chirp pop standards with insolent glee. David Bowers and Sam Fell directed. PG, 82 min.