Confirmed Cast

Dan Castellaneta as Homer Simpson, Abraham "Grampa" Simpson, Krusty the Clown, Barney Gumble, Groundskeeper Willie, and Itchy
Julie Kavner as Marge Simpson, Patty Bouvier, and Selma Bouvier
Nancy Cartwright as Bart Simpson, Nelson Muntz, Ralph Wiggum, and Todd Flanders
Yeardley Smith as Lisa Simpson
Hank Azaria as Moe Szyslak, Apu Nahasapeemapetilon, Chief Clancy Wiggum, Carl Carlson, The Sea Captain, and Bumblebee Man
Harry Shearer as Mr. Burns, Ned Flanders, Waylon Smithers, Seymour Skinner, Lenny Leonard, Dr. Hibbert, Reverend Lovejoy, Kent Brockman, Scratchy, and Otto Mann
Marcia Wallace as Edna Krabappel
Pamela Hayden as Milhouse Van Houten, Jimbo Jones, and Rod Flanders
Russi Taylor
Tress MacNeille
Maggie Roswell