Stanley Tucci Leonardo da Vinci (voice)
Allison Janney Ms. Grunion (voice)
Dennis Haysbert Judge (voice)
Thomas Lennon Italian Peasant #2 (voice)
Patrick Warburton Agamemnon (voice)
Stephen Tobolowsky Principal Purdy (voice)
Scott C. Lemmer Animation
Ariel Winter Penny Peterson (voice)
Max Charles Sherman (voice)
Scott Menville Additional Voices (voice)
Leslie Mann Patty Peterson (voice)
Rajesh P.K. Lead Animator
Robert Ben Garant Egyptian Spectator / Italian Peasant #1 (voice), Additional Dialogue
Michael T. Chen Animation
Milton E. Rodriguez-Rios CG Supervisor
Pat Musick Teacher (voice)
Ty Burrell Mr. Peabody (voice)
Michael W. Mitchell Sound Effects Editor
Lake Bell Mona Lisa (voice)
Mel Brooks Albert Einstein (voice)
Carlos Felipe León Ortiz Visual Development
Stephen Colbert Paul Peterson (voice)
Danny Elfman Original Music Composer
Christi Soper Hilt Casting
John Roesch Foley
Joanna Lynne Smith Production Coordinator
Darci Zalvin Executive In Charge Of Production
Alan Shearman Additional Voices (voice)
Jess Harnell Abraham Lincoln / George Washington / Bill Clinton / Isaac Newton / New York City Cop (voice)
Steve Mair Musician
Steve Valentine Ay (voice)
Bill Abbott Supervising Music Editor
Karan Brar Mason (voice)
Zach Callison King Tut (voice)
Jason Spencer-Galsworthy Supervising Animator
Riyad C.M. Animation
Richard King Sound Designer, Supervising Sound Editor
Andy Nelson Sound Re-Recording Mixer
Alyson Dee Moore Foley
Walt Dohrn French Peasant / Taxi Driver / Spartacus (voice)
Tom McGrath Odysseus (voice)
Rif Hutton Additional Voices (voice)
Ava Acres Additional Voices (voice)
Nicholas Guest French Peasant (voice)
Rob Minkoff Director, Creepy Boy (voice)
Jadon Sand Additional Voices (voice)
Sean Mahoney Animation
Michael Miller ADR & Dubbing
Jacqueline Pinol Additional Voices (voice)
Joshua Rush Carl (voice)
Jeff Fischer Additional Voices (voice)
Blake Bertrand Additional Voices (voice)
David Cowgill Additional Voices (voice)
Dennis Sands Scoring Mixer
Michael Babcock Sound Re-Recording Mixer, Sound Designer, Supervising Sound Editor
Jim Passon Color Timer
Julie Rogers Thanks
Joshua Sternin Thanks
Roger Linley Musician
Mark Berrow Musician
Donald Fullilove Additional Voices (voice)
John Ashton Thomas Additional Music, Orchestrator
Luisa Leschin Additional Voices (voice)
Chris Bacon Additional Music
Jung Jin Song Master Lighting Artist
Eva Bella Additional Voices (voice)
Jessica Gallavan Dialogue Editor
David Yanover Post-Production Manager
Hope Levy Additional Voices (voice)
Anna Noakes Musician
Jackie Gonneau Additional Voices (voice)
Steve Alterman Additional Voices (voice)