Stanley Tucci Leonardo da Vinci (voice)
Allison Janney Ms. Grunion (voice)
Patrick Warburton Agamemnon (voice)
Mel Brooks Albert Einstein (voice)
Leslie Mann Patty Peterson (voice)
Dennis Haysbert Judge (voice)
Pat Musick Teacher (voice)
Ariel Winter Penny Peterson (voice)
Stephen Tobolowsky Principal Purdy (voice)
Thomas Lennon Italian Peasant #2 (voice)
Lake Bell Mona Lisa (voice)
Stephen Colbert Paul Peterson (voice)
Ty Burrell Mr. Peabody (voice)
Scott Menville Additional Voices (voice)
Steve Valentine Ay (voice)
Karan Brar Mason (voice)
Max Charles Sherman (voice)
Tom McGrath Odysseus (voice)
Danny Elfman Original Music Composer
Alan Shearman Additional Voices (voice)
Zach Callison King Tut (voice)
Ava Acres Additional Voices (voice)
Richard King Sound Designer, Supervising Sound Editor
Nicholas Guest French Peasant (voice)
Jacqueline Pinol Additional Voices (voice)
Jess Harnell Abraham Lincoln / George Washington / Bill Clinton / Isaac Newton / New York City Cop (voice)
Robert Ben Garant Egyptian Spectator / Italian Peasant #1 (voice), Additional Dialogue
Jeff Fischer Additional Voices (voice)
Andy Nelson Sound Re-Recording Mixer
Walt Dohrn French Peasant / Taxi Driver / Spartacus (voice)
Rob Minkoff Director, Creepy Boy (voice)
Rif Hutton Additional Voices (voice)
David Cowgill Additional Voices (voice)
Joshua Rush Carl (voice)
Blake Bertrand Additional Voices (voice)
Joshua Sternin Thanks
Raymond Ochoa Additional Voices (voice)
Michael Babcock Sound Re-Recording Mixer, Sound Designer, Supervising Sound Editor
Chris Bacon Additional Music
Jim Passon Color Timer
Cullen McCarthy Kid (voice)
Newell Alexander Additional Voices (voice)
Jadon Sand Additional Voices (voice)
Eva Bella Additional Voices (voice)
Edie Mirman Additional Voices (voice)
Al Rodrigo Ajax (voice)
Stephen Apostolina Additional Voices (voice)
John Roesch Foley
Michael Miller ADR & Dubbing
Christi Soper Hilt Casting
Jackie Gonneau Additional Voices (voice)
Bill Abbott Supervising Music Editor
Donald Fullilove Additional Voices (voice)
Michelle Ruff Additional Voices (voice)
Dennis Sands Scoring Mixer
Craig Kellman Character Designer
Ryan Michero Master Lighting Artist
Steve Alterman Additional Voices (voice)
Steve Bartek Orchestrator
Rosemary Alexander Additional Voices (voice)
Luisa Leschin Additional Voices (voice)
Mitch Carter Additional Voices (voice)
Jason Clark Executive Producer
Guillaume Aretos Robespierre (voice)
Molly Jackson Additional Voices (voice)
David Zyler Additional Voices (voice)
Hope Levy Additional Voices (voice)
Michael W. Mitchell Sound Effects Editor
Lauri Fraser Marie Antoinette / Egyptian Woman (voice)
Cindy Freeman Production Coordinator
Lynnanne Zager Additional Voices (voice)
Nicholas Bucknall Musician