To emphasize the new feature, the series was retitled "Walt Disney's Wonderful World of Color" when NBC began airing it, retaining that moniker until 1969, by which time the big three networks were all broadcasting in color. The first NBC episode even dealt with the principles of color, as explained by a new character named Ludwig Von Drake (voiced by Paul Frees), a bumbling professor with a thick German accent, who was the uncle of Donald Duck. Von Drake was the first Disney character created specifically for television.