Kenny has many different voice actors. the original Kenny with his Parka is voiced by Matt Stone. Kenny as Mysterion is by Matt Stone aswell. the first time he spoke in the movie, he was voiced by Mike Judge, the creator of "Beavis and Butt-head" and "King of the Hill". In "The Jeffersons", "Lice Capades" and Mysterion Rises' he was voiced by Eric Stough. a former director of the South park studio's.