Elijah Wood and Robin Williams lend their voices to this animated feature about a tap-dancing penguin. In the great nation of Emperor Penguins, a penguin is nothing unless he can sing -- which is unfortunate for a tap-dancing penguin named Mumble, who is the worst singer in the world. Tired of feeling like a misfit amongst the other penguins, Mumble joins a posse of decidedly un-Emperor-like penguins for an epic adventure that teaches him the importance of being true to himself. Rated PG for some mild peril and rude humor. Also features the voices of Brittany Murphy, Hugh Jackman and Nicole Kidman.