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Dr. Jacques von Hämsterviel, the main antagonist of Lilo & Stitch: The Series, was voiced by Jeff Bennett. Bennett is a renowned voice actor known for his work in various animated films and television shows, including The Powerpuff Girls, Johnny Bravo, and Ben 10. His distinctive voice and comedic timing brought the character of Dr. Hämsterviel to life, making him a memorable and entertaining villain in the series.