This is a postcard from 'The Clone Wars' Comic Books.
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General Grievous is a fictional character in the Star Wars universe. He was voiced by Matthew Wood. According to the Revenge of the Sith DVD, series creator George Lucas instructed his creative team to create a villain that foreshadowed Anakin Skywalker's transformation into Darth Vader: the heavy breathing and the cyborg body.
General Grievous' asthmatic cough in Revenge of the Sith was intended to emphasize his organic nature as well as the flaws of cyborg prosthetics. Grievous had previously appeared in Clone Wars before many of his personality traits had been finalized. To reconcile the differences between the two presentations, Mace Windu uses the Force to crush Grievous' chest panel towards the end of the show's third season (Volume Two) as the general makes a desperate escape with Palpatine. Some of the audio effects for the coughing were taken from Lucas himself, who had bronchitis during principal photography.