Robert Anthony Rist is an American film, television and voice actor. He is known for playing Cousin Oliver in The Brady Bunch and Martin in Grady. Rist is also known for voicing assorted characters in television shows, games and movies, including Stuffy, the overly-proud stuffed dragon in Doc McStuffins, Whiz in Kidd Video, Star in Balto, Maroda in Final Fantasy X, Choji Akimichi in Naruto, and Michelangelo in the 1990 film Teenage Mutant Ninja Turtles. Additionally, he and director Anthony C. Ferrante provided music for the Sharknado film and the theme song for the Sharknado franchise. He played Ted Baxter's adopted son on the Mary Tyler Moore Show.