Stuart Stone (born Stuart Eisenstein) is a Canadian actor as well as a producer of television, film and music. He is best known for his roles as Ronald Fisher in Donnie Darko, Ralphie Tennelli in The Magic School Bus animated television series from 1994 to 1997, and Carl Crashman and C2 in Carl² from 2005 to 2011. Stone has also toured as a comedian and rapper. (Via Wikipedia)