Robin Williams

Theodore Roosevelt

Steve Coogan

Octavius

Brad Garrett

Easter Island Head (voice)

Matt Frewer

Archibald Stanley

Owen Wilson

Jedediah Smith

Dick Van Dyke

Cecil

Ben Kingsley

Merenkahre

Ben Stiller

Larry Daley / Laaa

Ricky Gervais

Dr. McPhee

Andrea Martin

Rose

Rebel Wilson

Tilly

Rachael Harris

Madeline Phelps

Michael Barnathan

Executive Producer

Dan Stevens

Sir Lancelot

Mary McLaglen

Executive Producer

Shawn Levy

Director

Mickey Rooney

Gus

Skyler Gisondo

Nick Daley

Bill Cobbs

Reginald

Patrick Gallagher

Attila the Hun

Brennan Elliott

Robert Fredericks

Matthew Harrison

Neanderthal #2

Dan Levine

Executive Producer

Rami Malek

Ahkmenrah

Mizuo Peck

Sacajawea

Kerry van der Griend

Neanderthal #1

Josh McLaglen

Executive Producer

Regina Taufen

New York Reporter (voice)

Percy Hynes White

C.J. Fredericks

David Guion

Executive Producer

Michael Handelman

Executive Producer