Nicole Sullivan
Joan of Arc (voice) (10 eps)
Mitra Jouhari
Cleopatra (voice) (10 eps)
Will Forte
Abe Lincoln (voice) (10 eps)
Christopher Miller
JFK / Mr. Butlertron (voice) (10 eps)
Vicci Martinez
Frida Kahlo (voice) (10 eps)
Ayo Edebiri
Harriet Tubman (voice) (10 eps)
Kelvin Yu
Confucius (voice) (10 eps)
Neil Casey
Topher Bus (voice) (10 eps)
Phil Lord
Principal Dr. Cinnamon J. Scudworth (voice) (10 eps)
Christa Miller
Candide Sampson (voice) (10 eps)
Donald Faison
George Washington Carver (voice) (7 eps)
Ian Ziering
Ian Ziering (voice) (1 eps)
Steve Kerr
Steve Kerr (voice) (1 eps)
Mandy Moore
Mandy Moore (voice) (1 eps)
David Tennant
David Tennant (voice) (1 eps)
Danny Pudi
Dr. Neelankavil (voice) (1 eps)
Stephen Root
Mr. Big Corporation (voice) (1 eps)
Mo Gaffney
Diane Grumbles (voice) (1 eps)
Sam Richardson
Wesley (voice) (1 eps)
Michael Bolton
Michael Bolton (voice) (1 eps)
Neil Flynn
Glen the Janitor (voice) (1 eps)
Judah Miller
Scangrade (voice) (1 eps)
