Troy Ataway - Kid Chorus
Julie Bernstein - Kid Chorus
Steve Bernstein - Kid Chorus, Chorus Singer
Jeff Glen Bennett - Plato, Kid Chorus, Alexander Graham Bell, Lucky Bob,
 Aristotle (8), Jefferson Davis, Leif Ericksson, Napoleon Bonaparte,
 Alexander the Great, Hernan Cortez, General Cornwallis, King George,
 David Labrador, Howard Carter, Marco Polo, Francis Scott Key, 
 Nikola Tesla, Ralph of Cornwallis, Ego, Pat Garrett
Clancy Brown - Wild Bill Hickok
Jim Cummings - Jean Paul Sarte, Atilla the Hun, Ring Announcer
Julia Duffy - Lizzie Borden
Nora Dunn - Libby/Statue of Liberty, Lydia Karaoke
Blake Ewing - Kid Chorus
Dorian Harewood - Nelson Mandela, Sherman Singing
Jess Harnell - Singing Senator, Singer, Wang Newton
Telma Howard - Rosa Parks
Casey Kasem - Calgary Kasem
Clyde Kusatu - Peking Man
Maurice LaMarche - Socrates, William Shakespeare, Eric the Red, Stalin,
 Abraham Lincoln, King Romulus, Olmec Statue, George Washington, Hannibal,
 Christopher Columbus, George McClellan, Ludwig v. Beethoven, Kemetic,
 Michelangelo, Francis Bellamy, Barry Ding
Elizabeth Lamers - Kid Chorus
Laraine Newman - Miss Information, Charity Bazaar, Mary Todd Lincoln,
 Joan of Arc, Kid Chorus, Amelia Earhart, Yin
 Sarah Coopersmith-Fitzwarren-Goldenheimer-Stein
Don Novello - Leonardo DaVinci
Tress MacNeille - Pepper Mills, World's Oldest Woman, Toast, Kid Chorus, 
 Daisy the Cow, Martha Washington, Indira Gandhi, Molly Pitcher, 
 Betsy Ross, Empress Maria Theresa, Josephine Bonaparte, Florence
 Nightengale, Super Ego
Chris Marquette - Kid Chorus
Jason Marsden - William Ramsey, Bucky
Rob Paulsen - Kid Chorus, Sammy Melman, Cleopatra (21), Mr. Smartypants, 
 Phineas Halberstam, Announcer, Cassius, Frank Gifforalcoatl, Paul Revere,
 King Arthur, Ferdinand Magellan, Lenin, King Tut, Hakon the Good,
 Sigmund Freud, James Madison, Fast-Talking Announcer, Benedict Arnold,
 John Philip Sousa, Ivan Pavlov, Dick Clarkonkommen, Johanes Gutenberg
 Rene Descartes, Turkey, Id, General Custer
Andrea Romano - The Director
Cody Ruegger - Loud Kiddington
Luke Ruegger - Big Fat Baby, Romulus and Remus, Billy the Kid
Nathan Ruegger - Froggo
Paul Rugg - Nostradamus, Montezuma, Dragon (14), Merlin, Baby Nostradamus,
 Meriweather Lewis, Sergei Eisenstein, Qinshihuangdi, Inti the Sun God, 
 Charles Darwin
Cree Summer - Aka Pella, Kid Chorus, Female Senator
Fred Travalena - Fooperman, Julius Caesar, Marc Antony, Pat Sommersault, 
 Ulysses S. Grant (10), William Clark (18), Gerald Ford, Lenny
Dick Tufeld - Announcer, Movie Trailer Announcer
Frank Welker - Father Time, F. Lee Bully, Fred Moppel, Pule Houser,
 King Solomon, King Numa Pompilius, Soothsayer, Admiral Richard Byrd,
 Sister Windbag
Adam West - Ernest Hemingway
Billy West - Chit Chatterson, Thomas Jefferson, Thomas Edison, Confucius, 
 Archimedes, General Sherman (10), Pinkerton, Ben Franklin, Kid Chorus, 
 Senator Pillius, Larry Patoltec, Joseph Guillotin, Crazy Ahmed, 
 Machiavelli, General Sherman (24), Trotsky, Henry VIII, Hormidac,
 Crazy Ahmed, Eagle, Genghis Khan, Doc Holliday, Bus Driver
James Wickline - Bill Straitman