Stuart Stone (born November 17, 1980), more commonly referred to as Stu Stone, is a Canadian actor and rapper. He is most well known for his voiceover work on the cartoon The Magic School Bus, where he voiced Ralphie Tennelli from 1994 to 1997, as well as Jamie Kennedy's Blowin' Up, a 2006 reality show documenting he and friend comedian Jamie Kennedy's making of a rap album.