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Megavolt, the electricity-wielding villain, is voiced by Dan Castellaneta in the animated series Darkwing Duck. Castellaneta is known for his distinctive voice acting, having voiced numerous characters in The Simpsons, Futurama, and other animated shows. Megavolt's voice is characterized by its high-pitched, nasally tone and exaggerated delivery, adding to the character's eccentric and menacing personality.