Most of the robots are voiced by Ben Burtt through mechanical sounds of his creation. He recorded 2500 different sounds for the film, twice the average of a Star Wars movie, and also the most that Burtt had ever recorded for one feature film. His involvement with the film lasted for two years. When Andrew Stanton met with Burtt to pitch the idea of him working on the film, he told him, "I need you to be 80% of my cast!"

Film

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