Peter Sohn as Sox Peter Sohn, an animator and director for Pixar, will voice Buzz's robotic kitten, Sox. He has lent his voice to a number of other Pixar projects, like "Monsters University" and "WALL-E." He was a production artist on "Toy Story 3" and worked as an animator on "Ratatouille" and "The Incredibles." Image Source: Getty / Dave J Hogan