, Steve Purcell, Brenda Chapman, and Irene Mecchi, directed by Andrews and Chapman [4]  and co-directed by Purcell. The film's voice cast features Kelly Macdonald, Julie Walters, Billy Connolly, Emma Thompson, Kevin McKidd,  Craig Ferguson ,  Robbie Coltrane , and John Ratzenberger. To make the most complex visuals possible, Pixar completely rewrote their animation system for the first time in