Stephen Colbert Paul Peterson (voice)
Karan Brar Mason (voice)
Patrick Warburton Agamemnon (voice)
Stanley Tucci Leonardo da Vinci (voice)
Leslie Mann Patty Peterson (voice)
Steve Valentine Ay (voice)
Allison Janney Ms. Grunion (voice)
Lake Bell Mona Lisa (voice)
Robert Ben Garant Egyptian Spectator / Italian Peasant #1 (voice), Additional Dialogue
Nicholas Guest French Peasant (voice)
Pat Musick Teacher (voice)
Ariel Winter Penny Peterson (voice)
Stephen Tobolowsky Principal Purdy (voice)
Newell Alexander Additional Voices (voice)
Roger Linley Musician
Jason Clark Executive Producer
Mel Brooks Albert Einstein (voice)
Dennis Sands Scoring Mixer
Dennis Haysbert Judge (voice)
Ty Burrell Mr. Peabody (voice)
Jadon Sand Additional Voices (voice)
Alan Shearman Additional Voices (voice)
Nico Sanghrajka Creature Technical Director
Eva Bella Additional Voices (voice)
Edgardo Simone Orchestrator
Max Charles Sherman (voice)
Zach Callison King Tut (voice)
Rosemary Alexander Additional Voices (voice)
Scott Menville Additional Voices (voice)
Danny Elfman Original Music Composer
David Cowgill Additional Voices (voice)
Ava Acres Additional Voices (voice)
Guillaume Aretos Robespierre (voice)
Thomas Lennon Italian Peasant #2 (voice)
Andy Nelson Sound Re-Recording Mixer
Steve Alterman Additional Voices (voice)
David Slonaker Orchestrator
David Zyler Additional Voices (voice)
Tom McGrath Odysseus (voice)
Stephen Apostolina Additional Voices (voice)
Rob Minkoff Director, Creepy Boy (voice)
Jess Harnell Abraham Lincoln / George Washington / Bill Clinton / Isaac Newton / New York City Cop (voice)
Joshua Rush Carl (voice)
Blake Bertrand Additional Voices (voice)
Rif Hutton Additional Voices (voice)
Nicholas Bucknall Musician
Walt Dohrn French Peasant / Taxi Driver / Spartacus (voice)
Zachary Gold Production Supervisor
Jacqueline Pinol Additional Voices (voice)
Matt Pomeroy Production Manager
Richard King Sound Designer, Supervising Sound Editor
Rachel Bolt Musician
David James Production Design
Al Rodrigo Ajax (voice)
Lauri Fraser Marie Antoinette / Egyptian Woman (voice)
Raymond Ochoa Additional Voices (voice)
Chris Bacon Additional Music
Leila Birch WABAC Machine (voice)
Craig Kellman Character Designer
Cindy Freeman Production Coordinator
Edie Mirman Additional Voices (voice)
Christi Soper Hilt Casting
Michael Miller ADR & Dubbing
Jason Spencer-Galsworthy Supervising Animator
Lynnanne Zager Additional Voices (voice)
Jim Passon Color Timer
Jeff Fischer Additional Voices (voice)
Julien Bocabeille Animation
Luisa Leschin Additional Voices (voice)
Angie Howard Production Manager
Molly Jackson Additional Voices (voice)
Joe Moshier Character Designer