Robert Anthony Rist is an American actor and voice artist. He is best known for his role as Cousin Oliver on The Brady Bunch, as well as Martin on Grady and Little John on Big John, Little John. Rist voiced Michelangelo in the original Teenage Mutant Ninja Turtles film trilogy (1990–1993) and later voiced Casey Jones in the 2011 installment. His extensive voice work also includes roles such as Stuffy in Doc McStuffins, Whiz in Kidd Video, Star in Balto, Maroda in Final Fantasy X, and Choji Akimi...