Stewart provided the voice for the blackbird suspect in Who Killed Cock Robin? and Br'er Bear in Song of the South (1946), Walt Disney's Mickey Mouse's Birthday Party (1954) and Splash Mountain (1989).
In 1989, Stewart was called back to Disney to reprise the role of Br'er Bear for the Splash Mountain ride. Disney Historian Jim Korkis asked him if he thought it was at all degrading to play Br'er Bear in Song of the South, regarding all the controversy of the portrayal of African-Americans. Stewart laughed and replied "Disney treated us like Kings". He concluded saying that the money he earned being Br'er Bear in Song of the South went towards a theatre for African-American actors to play roles other than butlers and maids. He also said he was to do the same thing with the money from the Splash Mountain ride.