What OTHER characters do Dan Castalanetta(voice of "Homer"),Julie Kavner(voice of "Marge"AND her sisters),Nancy Cartwright(voice of "Bart"),Harry Shearer("Mr.Smithers" and "Mr.Burns")and Yeardly Smith(voice of "Lisa")do?

While the majority of the cast does several voices, Yeardly smith is the only one who only does one voice, that of course is Lisa Simpson.

Dan also does Santa's Little Helper, Barney Gumble, Groundskeeper Willie, Mayor Quimby, Sideshow Mel, Itchy, Krusty and Grandpa (among others). Nancy is also Nelson
Muntz, Ralph Wiggum and Todd Flanders. Julie is also Grandma, Patty and
Selma Bouvier. Harry also does Dr. Hibbert, Eddie, Jasper, Kent Brockman, Lenny, Ned Flanders, Otto
Mann, Rev. Lovejoy, Scratchy, Jebediah Springield, Dr. Monroe and Seymour Skinner. That's not a complete list but some of the key characters.