Fred Tatasciore

Genghis Khan ​(voice) / Zeus ​(voice) / Leif Erikson ​(voice) / Robert Edwin Perry ​(voice) / Charles Dickens ​(voice) / David Bushnell ​(voice) / Winston Churchill ​(voice)

8 eps

Nolan North

Jesse James ​(voice) / Alexander Cartwright ​(voice) / Marco Polo (voice) / John Sutter ​(voice)

5 eps

Tom Kenny

​(voice) / Blackbeard ​(voice) / Nicholas-Joseph Cugnot ​(voice)

4 eps

Kari Wahlgren

Annie Oakley ​(voice) / Ada Lovelace ​(voice) / Lucy Walker ​(voice) / Queen Hatshepsut ​(voice)

4 eps

Jeff Bennett

John Harrington ​(voice) / Mark Twain ​(voice) / Harry Houdini ​(voice)

3 eps

Michael-Leon Wooley

Ziryab ​(voice) / George Crum ​(voice) / ​(voice)

3 eps

Grey DeLisle

Mary Anning ​(voice) / Cleopatra ​(voice) / Eunice Butters ​(voice)

3 eps

Eric Bauza

Galileo ​(voice) / Additional Voices

2 eps

Dee Bradley Baker

​(voice) / Mozart (voice)

2 eps

Joshua Rush

Wheels (voice) / ​(voice)

2 eps